Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Sr”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 91 records · Page 5
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the monoclinic Pc space group. The structure is two-dimensional and consists of two Sr(H8O5)2 sheets oriented in the (0, 0, 1) direction. Sr is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Sr–O bond distances ranging from 2.64–2.68 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the second H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.60 Å) H–O bond length. In the third H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.64 Å) H–O bond length. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the fifth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.58 Å) H–O bond length. In the sixth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the seventh H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.65 Å) H–O bond length. In the eighth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the ninth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.65 Å) H–O bond length. In the tenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the eleventh H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.67 Å) H–O bond length. In the twelfth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the thirteenth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.64 Å) H–O bond length. In the fourteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the fifteenth H site, H is bonded in a single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.69 Å) H–O bond length. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.01 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a 5-coordinate geometry to four H and one O atom. The O–O bond length is 1.50 Å. In the second O site, O is bonded in a 5-coordinate geometry to four H and one O atom. In the third O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the eighth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the monoclinic Cc space group. The structure is two-dimensional and consists of two Sr(H8O5)2 sheets oriented in the (0, 0, 1) direction. Sr is bonded in a 2-coordinate geometry to eight O atoms. There are a spread of Sr–O bond distances ranging from 2.49–2.80 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.68 Å) H–O bond length. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the third H site, H is bonded in a single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.70 Å) H–O bond length. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fifth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the sixth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.59 Å) H–O bond length. In the seventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the eighth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.58 Å) H–O bond length. In the ninth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the tenth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.61 Å) H–O bond length. In the eleventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the twelfth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the thirteenth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.65 Å) H–O bond length. In the fourteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fifteenth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.62 Å) H–O bond length. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a 5-coordinate geometry to four H and one O atom. The O–O bond length is 1.50 Å. In the second O site, O is bonded in a 4-coordinate geometry to three H and one O atom. In the third O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the eighth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. Sr is bonded in a 7-coordinate geometry to one H and seven O atoms. The Sr–H bond length is 2.70 Å. There are a spread of Sr–O bond distances ranging from 2.53–2.63 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.70 Å) H–O bond length. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the third H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fourth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.65 Å) H–O bond length. In the fifth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the sixth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.64 Å) H–O bond length. In the seventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the eighth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.06 Å) and one longer (1.51 Å) H–O bond length. In the ninth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.62 Å) H–O bond length. In the tenth H site, H is bonded in a single-bond geometry to one Sr and one O atom. The H–O bond length is 0.99 Å. In the eleventh H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.12 Å) and one longer (1.34 Å) H–O bond length. In the twelfth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the thirteenth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fourteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fifteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a 4-coordinate geometry to three H and one O atom. The O–O bond length is 1.48 Å. In the second O site, O is bonded in a single-bond geometry to one H and one O atom. In the third O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a 2-coordinate geometry to four H atoms. In the eighth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one Sr(H8O5)2 sheet oriented in the (0, 0, 1) direction. Sr is bonded in a distorted body-centered cubic geometry to eight O atoms. There are a spread of Sr–O bond distances ranging from 2.57–2.64 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.61 Å) H–O bond length. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the third H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.64 Å) H–O bond length. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the fifth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the sixth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.61 Å) H–O bond length. In the seventh H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.68 Å) H–O bond length. In the eighth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the ninth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the tenth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.67 Å) H–O bond length. In the eleventh H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.61 Å) H–O bond length. In the twelfth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the thirteenth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.65 Å) H–O bond length. In the fourteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the fifteenth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.67 Å) H–O bond length. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a 5-coordinate geometry to four H and one O atom. The O–O bond length is 1.50 Å. In the second O site, O is bonded in a 5-coordinate geometry to four H and one O atom. In the third O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the eighth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr by Materials Project

Sr is alpha La structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Sr sites. In the first Sr site, Sr is bonded to twelve Sr atoms to form a mixture of face, edge, and corner-sharing SrSr12 cuboctahedra. All Sr–Sr bond lengths are 4.26 Å. In the second Sr site, Sr is bonded to twelve Sr atoms to form a mixture of face, edge, and corner-sharing SrSr12 cuboctahedra. All Sr–Sr bond lengths are 4.26 Å.

36 MATERIALS SCIENCE↗
NASA NTRS2009

Silica-Aerogel Composites Opacified with La(0.7)Sr(0.3)MnO3

As part of an effort to develop improved lightweight thermal-insulation tiles to withstand temperatures up to 1,000 C, silica aerogel/fused-quartz-fiber composite materials containing La0.7Sr0.3MnO3 particles as opacifiers have been investigated as potentially offering thermal conductivities lower than those of the otherwise equivalent silica-aerogel composite materials not containing La(0.7)Sr(0.3)MnO3 particles. The basic idea of incorporating opacifying particles into silica-aerogels composite to reduce infrared radiative contributions to thermal conductivities at high temperatures is not new: it has been reported in a number of previous NASA Tech Briefs articles. What is new here is the selection of La(0.7)Sr(0.3)MnO3 particles as candidate opacifiers that, in comparison with some prior opacifiers (carbon black and metal nanoparticles), are more thermally stable. The preparation of a composite material of the present type includes synthesis of the silica-aerogel component in a sol-gel process. The La(0.7)Sr(0.3)MnO3 particles, made previously in a separate process, are mixed into the sol, which is then cast onto fused-quartz-fiber batting. Then the aerogel-casting solution is poured into the mold, where it permeates the silica fiber felt. After the sol has gelled, the casting is aged and then subjected to supercritical drying to convert the gel to the final aerogel form. The separate process for making the La(0.7)Sr(0.3)MnO3 particles begins with the slow addition of corresponding proportions of La(CH3COOH)3, Mn(CH3COOH)3, and Sr(NO3)2 to a solution of H2O2 in H2O. The solution is then peptized by drop-wise addition of NH4OH to obtain a sol. Next, the sol is dried in an oven at a temperature of 120 C to obtain a glassy solid. The solid is calcined at 700 C to convert it to La(0.7)Sr(0.3)MnO3. Then La(0.7)Sr(0.3)MnO3 particles are made by ball-milling the calcined solid. The effectiveness of La(0.7)Sr(0.3)MnO3 particles as opacifiers and thermal-conductivity reducers depends on the statistical distribution of particle sizes as well as the relative proportions of La(0.7)Sr(0.3)MnO3 and aerogel. For experiments performed thus far, samples of aerogel/fiber composites were formulated to have, variously, silica target density of 0.07 or 0.14 g/cu cm and to contain 30 percent of La(0.7)Sr(0.3)MnO3 in average particle size of 0.3 or 3 microns. The thermal conductivities of the samples containing the 3 micron La(0.7)Sr(0.3)MnO3 particles were found to be lower than those of the samples containing the 0.3 micron La(0.7)Sr(0.3)MnO3 particles. The optimum particle size is believed to be between 1 and 5 microns.

Rhine, Wendell↗
DOE OSTI2020

Materials Data on Sr(H2O3)2 by Materials Project

Sr(H2O3)2 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. Sr is bonded in a 1-coordinate geometry to one H and nine O atoms. The Sr–H bond length is 2.66 Å. There are a spread of Sr–O bond distances ranging from 2.61–3.06 Å. There are four inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the second H site, H is bonded in a single-bond geometry to one Sr and one O atom. The H–O bond length is 0.98 Å. In the third H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fourth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.55 Å) H–O bond length. There are six inequivalent O sites. In the first O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the second O site, O is bonded in a single-bond geometry to two equivalent Sr, one H, and one O atom. The O–O bond length is 1.48 Å. In the third O site, O is bonded in a single-bond geometry to two equivalent Sr and one H atom. In the fourth O site, O is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sr and one O atom. In the fifth O site, O is bonded in a distorted single-bond geometry to one Sr, one H, and one O atom. The O–O bond length is 1.32 Å. In the sixth O site, O is bonded in a 1-coordinate geometry to one Sr and one O atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Sr–O bond distances ranging from 2.51–2.75 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.60 Å) H–O bond length. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the third H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.64 Å) H–O bond length. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the fifth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.66 Å) H–O bond length. In the sixth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the seventh H site, H is bonded in a single-bond geometry to two O atoms. There is one shorter (1.00 Å) and one longer (1.73 Å) H–O bond length. In the eighth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the ninth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.68 Å) H–O bond length. In the tenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the eleventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the twelfth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.71 Å) H–O bond length. In the thirteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fourteenth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.64 Å) H–O bond length. In the fifteenth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.61 Å) H–O bond length. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a 5-coordinate geometry to four H and one O atom. The O–O bond length is 1.51 Å. In the second O site, O is bonded in a 5-coordinate geometry to four H and one O atom. In the third O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the eighth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Sr–O bond distances ranging from 2.58–2.79 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the third H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.53 Å) H–O bond length. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fifth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the sixth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.05 Å) and one longer (1.48 Å) H–O bond length. In the seventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the eighth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the ninth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.62 Å) H–O bond length. In the tenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the eleventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the twelfth H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.60 Å) H–O bond length. In the thirteenth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.54 Å) H–O bond length. In the fourteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fifteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a distorted L-shaped geometry to two H and one O atom. The O–O bond length is 1.51 Å. In the second O site, O is bonded in a 4-coordinate geometry to three H and one O atom. In the third O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the eighth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the monoclinic Cc space group. The structure is two-dimensional and consists of two Sr(H8O5)2 sheets oriented in the (0, 0, 1) direction. Sr is bonded in a distorted pentagonal bipyramidal geometry to seven O atoms. There are a spread of Sr–O bond distances ranging from 2.50–2.66 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.72 Å) H–O bond length. In the second H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the third H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the fourth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the fifth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the sixth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.05 Å) and one longer (1.50 Å) H–O bond length. In the seventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the eighth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.05 Å) and one longer (1.52 Å) H–O bond length. In the ninth H site, H is bonded in a distorted bent 150 degrees geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.61 Å) H–O bond length. In the tenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the eleventh H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.20 Å) and one longer (1.23 Å) H–O bond length. In the twelfth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the thirteenth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fourteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fifteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a distorted tetrahedral geometry to three H and one O atom. The O–O bond length is 1.48 Å. In the second O site, O is bonded in a single-bond geometry to one H and one O atom. In the third O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a distorted water-like geometry to three H atoms. In the eighth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(BO4)2 by Materials Project

Sr(BO4)2 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one Sr(BO4)2 sheet oriented in the (0, 1, 1) direction. Sr is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Sr–O bond distances ranging from 2.53–2.89 Å. There are two inequivalent B sites. In the first B site, B is bonded in a tetrahedral geometry to four O atoms. There are a spread of B–O bond distances ranging from 1.41–1.49 Å. In the second B site, B is bonded in a tetrahedral geometry to four O atoms. There are a spread of B–O bond distances ranging from 1.42–1.47 Å. There are eight inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to two equivalent Sr and one B atom. In the second O site, O is bonded in a distorted bent 150 degrees geometry to one Sr and one B atom. In the third O site, O is bonded in a distorted single-bond geometry to one Sr and one B atom. In the fourth O site, O is bonded in a distorted single-bond geometry to one Sr and one B atom. In the fifth O site, O is bonded in a distorted single-bond geometry to one Sr and one B atom. In the sixth O site, O is bonded in a distorted single-bond geometry to one Sr and one B atom. In the seventh O site, O is bonded in a single-bond geometry to one B atom. In the eighth O site, O is bonded in a distorted single-bond geometry to one Sr and one B atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the monoclinic Cc space group. The structure is two-dimensional and consists of two Sr(H8O5)2 sheets oriented in the (0, 0, 1) direction. Sr is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Sr–O bond distances ranging from 2.51–2.75 Å. There are sixteen inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the third H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.06 Å) and one longer (1.46 Å) H–O bond length. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fifth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the sixth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.05 Å) and one longer (1.54 Å) H–O bond length. In the seventh H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the eighth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.56 Å) H–O bond length. In the ninth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. In the tenth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.02 Å) and one longer (1.64 Å) H–O bond length. In the eleventh H site, H is bonded in a distorted linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.60 Å) H–O bond length. In the twelfth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the thirteenth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.65 Å) H–O bond length. In the fourteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fifteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the sixteenth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.54 Å) H–O bond length. There are ten inequivalent O sites. In the first O site, O is bonded in a 4-coordinate geometry to three H and one O atom. The O–O bond length is 1.49 Å. In the second O site, O is bonded in a 5-coordinate geometry to four H and one O atom. In the third O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the fifth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a water-like geometry to two H atoms. In the eighth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the ninth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(In4Rh)2 by Materials Project

Sr(RhIn4)2 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. Sr is bonded in a 12-coordinate geometry to thirteen In atoms. There are a spread of Sr–In bond distances ranging from 3.45–3.83 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 9-coordinate geometry to nine In atoms. There are a spread of Rh–In bond distances ranging from 2.69–2.98 Å. In the second Rh site, Rh is bonded in a 9-coordinate geometry to nine In atoms. There are a spread of Rh–In bond distances ranging from 2.65–2.93 Å. There are nine inequivalent In sites. In the first In site, In is bonded in a 4-coordinate geometry to two equivalent Sr, two equivalent Rh, and eight In atoms. There are a spread of In–In bond distances ranging from 3.14–3.36 Å. In the second In site, In is bonded in a 4-coordinate geometry to two equivalent Sr, two equivalent Rh, and one In atom. The In–In bond length is 2.95 Å. In the third In site, In is bonded in a 2-coordinate geometry to two equivalent Sr, two equivalent Rh, and one In atom. In the fourth In site, In is bonded in a 4-coordinate geometry to four equivalent Rh atoms. In the fifth In site, In is bonded in a 2-coordinate geometry to two equivalent Sr, two equivalent Rh, and one In atom. In the sixth In site, In is bonded in a 1-coordinate geometry to three Rh atoms. In the seventh In site, In is bonded in a 2-coordinate geometry to two equivalent Sr, two equivalent Rh, and three In atoms. In the eighth In site, In is bonded in a distorted linear geometry to two equivalent Sr, two Rh, and two equivalent In atoms. In the ninth In site, In is bonded in a distorted linear geometry to two equivalent Sr, two equivalent Rh, and four equivalent In atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(H8O5)2 by Materials Project

Sr(H8O5)2 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one Sr(H8O5)2 sheet oriented in the (0, 1, 1) direction. Sr is bonded in a 6-coordinate geometry to six O atoms. There are two shorter (2.56 Å) and four longer (2.63 Å) Sr–O bond lengths. There are sixteen inequivalent H sites. In the first H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the second H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the third H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.58 Å) H–O bond length. In the fourth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the fifth H site, H is bonded in a distorted single-bond geometry to one O atom. The H–O bond length is 1.01 Å. In the sixth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the seventh H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.05 Å) and one longer (1.54 Å) H–O bond length. In the eighth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. In the ninth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the tenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the eleventh H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.03 Å) and one longer (1.58 Å) H–O bond length. In the twelfth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.99 Å. In the thirteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 1.00 Å. In the fourteenth H site, H is bonded in a distorted single-bond geometry to two O atoms. There is one shorter (1.01 Å) and one longer (1.70 Å) H–O bond length. In the fifteenth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.55 Å) H–O bond length. In the sixteenth H site, H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.97 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to two H and one O atom. The O–O bond length is 1.51 Å. In the second O site, O is bonded in a 2-coordinate geometry to three H and one O atom. In the third O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the fourth O site, O is bonded in a water-like geometry to two H atoms. In the fifth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the sixth O site, O is bonded in a water-like geometry to one Sr and two H atoms. In the seventh O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the eighth O site, O is bonded in a water-like geometry to two H atoms. In the ninth O site, O is bonded in a distorted water-like geometry to one Sr and two H atoms. In the tenth O site, O is bonded in a water-like geometry to one Sr and two H atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(In4Ir)2 by Materials Project

Sr(IrIn4)2 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. Sr is bonded in a 12-coordinate geometry to thirteen In atoms. There are a spread of Sr–In bond distances ranging from 3.46–3.83 Å. There are two inequivalent Ir sites. In the first Ir site, Ir is bonded in a 9-coordinate geometry to nine In atoms. There are a spread of Ir–In bond distances ranging from 2.63–2.95 Å. In the second Ir site, Ir is bonded in a 9-coordinate geometry to nine In atoms. There are a spread of Ir–In bond distances ranging from 2.66–3.01 Å. There are nine inequivalent In sites. In the first In site, In is bonded in a 4-coordinate geometry to four equivalent Ir and two equivalent In atoms. Both In–In bond lengths are 3.05 Å. In the second In site, In is bonded in a distorted linear geometry to two equivalent Sr, two equivalent Ir, and four equivalent In atoms. All In–In bond lengths are 3.14 Å. In the third In site, In is bonded in a 4-coordinate geometry to two equivalent Sr, two equivalent Ir, and eight In atoms. There are a spread of In–In bond distances ranging from 3.15–3.35 Å. In the fourth In site, In is bonded in a 4-coordinate geometry to two equivalent Sr, two equivalent Ir, and three In atoms. There are a spread of In–In bond distances ranging from 2.94–3.43 Å. In the fifth In site, In is bonded in a 2-coordinate geometry to two equivalent Sr, two equivalent Ir, and eight In atoms. There are a spread of In–In bond distances ranging from 2.97–3.42 Å. In the sixth In site, In is bonded in a 2-coordinate geometry to two equivalent Sr, two equivalent Ir, and four In atoms. In the seventh In site, In is bonded in a 4-coordinate geometry to two equivalent Sr, two equivalent Ir, and six In atoms. Both In–In bond lengths are 3.27 Å. In the eighth In site, In is bonded in a distorted linear geometry to two equivalent Sr, two Ir, and six In atoms. In the ninth In site, In is bonded in a 1-coordinate geometry to three Ir and two equivalent In atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1989

Sr isotopic variations in Upper Proterozoic carbonates from Svalbard and East Greenland

Precambrian Sr isotope stratigraphy was investigated by determining variations in Sr-87/Sr-86 ratios in the Upper Proterozoic carbonate succession from Svalbard and East Greenland. Data from this study were combined with those from literature to construct a curve of Sr-87/Sr-86 versus time for Upper Proterozoic seawater. The curve for the Upper Riphean-Vandian showed that the isotopic composition of Sr in seawater was low (Delta Sr-87 of about -500) between 900 and 650 Ma but rose rapidly to about +30 by 600 Ma (this range of long-term variation exceeds the total Phanerozoic variation). The very low values of Delta Sr-87 inferred for the Riphean require that, for this time, the submarine hydrothermal water flux was a large fraction of the Sr input to the oceans, while the rise in Delta Sr-87 in the Upper Proterozoic seawater reflects both a change in the ratio of hydrothermal and continental fluxes of Sr to the oceans, and a change in the isotopic composition of Sr from continental sources.

Derry, Louis A.↗
NASA NTRS1993

Fine resolution chronology based on initial Sr-87/Sr-86

It has been recognized that small variations in initial Sr-87/Sr-86 (Sr(sub I)), can provide a fine scale relative chronology for the chemical fractionation of materials with low Rb/Sr from parent reservoirs with high Rb/Sr. Similarly, Sr(sub I), as determined for low Rb/Sr phases in meteorites, may permit a fine resolution chronology of the recrystallization or metamorphism of planetary materials. For the establishment of a primitive Sr-87/Sr-86 chronology, it is important to search for samples with extremely low Rb/Sr for which the measured Sr-87/Sr-86 is below BABI, in which case the primitive nature of the Sr can be directly established. Using the measured Rb/Sr to calculate an initial Sr-87/Sr-86 can introduce substantial uncertainty if the Rb-Sr are disturbed. We report Sr-87/Sr-86 in plagioclase from silicate pebbles from the Vaca Muerta mesosiderite on which we have reported Sm-147-Nd-143 and Ne-142 correlations. For the purpose of cross-calibration with our previous work we have performed extensive new measurements on Angra dos Reis and on anorthite from Moore County, which have very low Rb/Sr and primitive Sr-87/Sr-86.

Stewart, B. W.↗
DOE OSTI2020

Materials Data on Sr(H2O3)2 by Materials Project

Sr(H2O3)2 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. Sr is bonded in a 10-coordinate geometry to ten O atoms. There are a spread of Sr–O bond distances ranging from 2.61–2.81 Å. There are four inequivalent H sites. In the first H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.07 Å) and one longer (1.44 Å) H–O bond length. In the second H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.07 Å) and one longer (1.44 Å) H–O bond length. In the third H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.53 Å) H–O bond length. In the fourth H site, H is bonded in a linear geometry to two O atoms. There is one shorter (1.04 Å) and one longer (1.53 Å) H–O bond length. There are six inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to two equivalent Sr and one H atom. In the second O site, O is bonded in a single-bond geometry to two equivalent Sr and one H atom. In the third O site, O is bonded in a single-bond geometry to one Sr and one H atom. In the fourth O site, O is bonded in a single-bond geometry to one Sr and one H atom. In the fifth O site, O is bonded in a 2-coordinate geometry to two equivalent Sr and two H atoms. In the sixth O site, O is bonded in a 2-coordinate geometry to two equivalent Sr and two H atoms.

36 MATERIALS SCIENCE↗