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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on La(NO3)3 by Materials Project

La(NO3)3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are three inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to twelve O2- atoms to form corner-sharing LaO12 cuboctahedra. There are a spread of La–O bond distances ranging from 2.66–2.72 Å. In the second La3+ site, La3+ is bonded to twelve O2- atoms to form distorted corner-sharing LaO12 cuboctahedra. There are a spread of La–O bond distances ranging from 2.65–2.82 Å. In the third La3+ site, La3+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of La–O bond distances ranging from 2.59–2.81 Å. There are six inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.25–1.30 Å. In the second N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.31 Å. In the third N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.25 Å) and one longer (1.30 Å) N–O bond length. In the fourth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.25 Å) and one longer (1.30 Å) N–O bond length. In the fifth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.25–1.28 Å. In the sixth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.25–1.30 Å. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two La3+ and one N5+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two La3+ and one N5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two La3+ and one N5+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to two La3+ and one N5+ atom. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the twelfth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the thirteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the fourteenth O2- site, O2- is bonded in a distorted single-bond geometry to two La3+ and one N5+ atom. In the fifteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the sixteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the seventeenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the eighteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La2Mg3H48(NO5)12 by Materials Project

(Mg(H2O)6)3(La(NO3)6)2(H2O)6 is Brookite-derived structured and crystallizes in the trigonal R-3 space group. The structure is zero-dimensional and consists of nine magnesium;hexahydrate molecules, eighteen water molecules, and six La(NO3)6 clusters. In each La(NO3)6 cluster, La is bonded in a cuboctahedral geometry to twelve O atoms. There are a spread of La–O bond distances ranging from 2.67–2.71 Å. There are two inequivalent N sites. In the first N site, N is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.24 Å) and two longer (1.28 Å) N–O bond length. In the second N site, N is bonded in a trigonal planar geometry to three O atoms. There are a spread of N–O bond distances ranging from 1.24–1.29 Å. There are six inequivalent O sites. In the first O site, O is bonded in a distorted single-bond geometry to one La and one N atom. In the second O site, O is bonded in a distorted single-bond geometry to one La and one N atom. In the third O site, O is bonded in a single-bond geometry to one N atom. In the fourth O site, O is bonded in a distorted single-bond geometry to one La and one N atom. In the fifth O site, O is bonded in a distorted single-bond geometry to one La and one N atom. In the sixth O site, O is bonded in a single-bond geometry to one N atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaH6S3(NO3)3 by Materials Project

La(NH2SO3)3 crystallizes in the hexagonal P6_3 space group. The structure is three-dimensional. La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are six shorter (2.47 Å) and three longer (2.75 Å) La–O bond lengths. N5+ is bonded in a distorted trigonal non-coplanar geometry to two H1+ and one S2- atom. Both N–H bond lengths are 1.03 Å. The N–S bond length is 1.66 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. S2- is bonded in a tetrahedral geometry to one N5+ and three O2- atoms. There are a spread of S–O bond distances ranging from 1.45–1.48 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to one La3+ and one S2- atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one La3+ and one S2- atom. In the third O2- site, O2- is bonded in a single-bond geometry to one La3+ and one S2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaH6S3(NO3)3 by Materials Project

La(NH2SO3)3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.53–2.59 Å. In the second La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.53–2.61 Å. There are six inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a distorted trigonal non-coplanar geometry to two H1+ and one S2- atom. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. The N–S bond length is 1.66 Å. In the second N5+ site, N5+ is bonded in a distorted trigonal non-coplanar geometry to two H1+ and one S2- atom. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. The N–S bond length is 1.66 Å. In the third N5+ site, N5+ is bonded in a trigonal non-coplanar geometry to two H1+ and one S2- atom. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. The N–S bond length is 1.66 Å. In the fourth N5+ site, N5+ is bonded in a distorted trigonal non-coplanar geometry to two H1+ and one S2- atom. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. The N–S bond length is 1.66 Å. In the fifth N5+ site, N5+ is bonded in a trigonal non-coplanar geometry to two H1+ and one S2- atom. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. The N–S bond length is 1.65 Å. In the sixth N5+ site, N5+ is bonded in a distorted trigonal non-coplanar geometry to two H1+ and one S2- atom. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. The N–S bond length is 1.66 Å. There are twelve inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the tenth H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the eleventh H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. In the twelfth H1+ site, H1+ is bonded in a single-bond geometry to one N5+ atom. There are six inequivalent S2- sites. In the first S2- site, S2- is bonded in a tetrahedral geometry to one N5+ and three O2- atoms. There is one shorter (1.46 Å) and two longer (1.47 Å) S–O bond length. In the second S2- site, S2- is bonded in a tetrahedral geometry to one N5+ and three O2- atoms. There is one shorter (1.46 Å) and two longer (1.47 Å) S–O bond length. In the third S2- site, S2- is bonded in a tetrahedral geometry to one N5+ and three O2- atoms. There is one shorter (1.46 Å) and two longer (1.47 Å) S–O bond length. In the fourth S2- site, S2- is bonded in a tetrahedral geometry to one N5+ and three O2- atoms. There is one shorter (1.46 Å) and two longer (1.47 Å) S–O bond length. In the fifth S2- site, S2- is bonded in a tetrahedral geometry to one N5+ and three O2- atoms. There is one shorter (1.46 Å) and two longer (1.47 Å) S–O bond length. In the sixth S2- site, S2- is bonded in a tetrahedral geometry to one N5+ and three O2- atoms. There is one shorter (1.46 Å) and two longer (1.47 Å) S–O bond length. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the twelfth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the thirteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the fourteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the fifteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the sixteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the seventeenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom. In the eighteenth O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one S2- atom.

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↗
NASA NTRS1986

Comparative isosteric ion adsorption for minerals

A comparative isosteric ion adsorption study for minerals (kaolinite, rutile, and quartz) was performed in aqueous solutions of CaCl2, LaCl3, and Th(NO3)4 in the presence of the neutral salt NaCl. It was observed that the concentration of Ca(2+) ions required to produce a standard reduction in the electrophoretic mobility of mineral particles was always appreciably greater than the concentration required for the Th(4+) ions. The effectiveness of adsorption of the cations differed from particle to particle and showed that ion adsorption on a mineral surface depends, among other things, on the nature of the mineral surface and on the particular adsorbed cation. The number of cation binding sites on mineral surfaces and the electrochemical free energies of cation adsorption were calculated. It was found that the adsorption energy of La(3+) and Th(4+) ions on rutile, kaolinite, and quartz was greater than that of Ca(2+) on these minerals.

Omenyi, Samuel N.↗
DOE OSTI2020

Materials Data on Li2La(NO3)5 by Materials Project

Li2La(NO3)5 crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Li1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Li–O bond distances ranging from 2.11–2.71 Å. There are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to twelve O2- atoms to form corner-sharing LaO12 cuboctahedra. There are a spread of La–O bond distances ranging from 2.67–2.71 Å. In the second La3+ site, La3+ is bonded to twelve O2- atoms to form corner-sharing LaO12 cuboctahedra. There are a spread of La–O bond distances ranging from 2.64–2.79 Å. There are four inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.23 Å) and two longer (1.29 Å) N–O bond length. In the second N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.25 Å) and one longer (1.31 Å) N–O bond length. In the third N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.29 Å. In the fourth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.26 Å) and two longer (1.27 Å) N–O bond length. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one La3+, and one N5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one La3+ and one N5+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to one Li1+, one La3+, and one N5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two La3+ and one N5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one La3+, and one N5+ atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to two equivalent Li1+ and one N5+ atom. In the seventh O2- site, O2- is bonded in a distorted water-like geometry to one Li1+, one La3+, and one N5+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one La3+ and one N5+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Li1+ and one N5+ atom. In the tenth O2- site, O2- is bonded in a T-shaped geometry to two equivalent Li1+ and one N5+ atom.

36 MATERIALS SCIENCE↗