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24 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaBi3(IO2)2 by Materials Project

NaBi3(O2I)2 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Na1+ is bonded in a 4-coordinate geometry to four equivalent O2- and four I1- atoms. All Na–O bond lengths are 2.42 Å. There are two shorter (3.57 Å) and two longer (3.62 Å) Na–I bond lengths. There are three inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four equivalent O2- and four I1- atoms. All Bi–O bond lengths are 2.26 Å. There are two shorter (3.62 Å) and two longer (3.66 Å) Bi–I bond lengths. In the second Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four equivalent O2- and four I1- atoms. All Bi–O bond lengths are 2.29 Å. There are two shorter (3.63 Å) and two longer (3.67 Å) Bi–I bond lengths. In the third Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four equivalent O2- and four I1- atoms. All Bi–O bond lengths are 2.29 Å. There are two shorter (3.62 Å) and two longer (3.66 Å) Bi–I bond lengths. O2- is bonded to one Na1+ and three Bi3+ atoms to form a mixture of edge and corner-sharing ONaBi3 tetrahedra. There are two inequivalent I1- sites. In the first I1- site, I1- is bonded in a distorted body-centered cubic geometry to two equivalent Na1+ and six Bi3+ atoms. In the second I1- site, I1- is bonded in a distorted body-centered cubic geometry to two equivalent Na1+ and six Bi3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrAg2(IO2)4 by Materials Project

SrAg2(O2I)4 crystallizes in the tetragonal I422 space group. The structure is three-dimensional. Sr2+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Sr–O bond lengths are 2.59 Å. Ag3+ is bonded in a distorted square co-planar geometry to four equivalent O2- atoms. All Ag–O bond lengths are 2.38 Å. O2- is bonded to one Sr2+, one Ag3+, and two equivalent I2+ atoms to form a mixture of distorted edge and corner-sharing OSrAgI2 tetrahedra. There are one shorter (1.99 Å) and one longer (2.44 Å) O–I bond lengths. I2+ is bonded in a square co-planar geometry to four equivalent O2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrCd(IO2)4 by Materials Project

SrCd(O2I)4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sr is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Sr–O bond distances ranging from 2.48–2.93 Å. There are two inequivalent Cd sites. In the first Cd site, Cd is bonded in a 4-coordinate geometry to two equivalent O and two equivalent I atoms. Both Cd–O bond lengths are 2.28 Å. There are one shorter (2.74 Å) and one longer (2.80 Å) Cd–I bond lengths. In the second Cd site, Cd is bonded in a 4-coordinate geometry to two equivalent O and two equivalent I atoms. Both Cd–O bond lengths are 2.29 Å. There are one shorter (2.75 Å) and one longer (2.84 Å) Cd–I bond lengths. There are eight inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to two equivalent Sr and one I atom. The O–I bond length is 1.85 Å. In the second O site, O is bonded in an L-shaped geometry to one Sr and one I atom. The O–I bond length is 1.87 Å. In the third O site, O is bonded in a distorted water-like geometry to one Cd and two I atoms. There are one shorter (1.93 Å) and one longer (2.67 Å) O–I bond lengths. In the fourth O site, O is bonded in a distorted T-shaped geometry to one Sr and two I atoms. There are one shorter (1.90 Å) and one longer (2.53 Å) O–I bond lengths. In the fifth O site, O is bonded in a 3-coordinate geometry to one Cd and two I atoms. There are one shorter (1.95 Å) and one longer (2.51 Å) O–I bond lengths. In the sixth O site, O is bonded in a 2-coordinate geometry to one Sr and two I atoms. There are one shorter (1.87 Å) and one longer (2.66 Å) O–I bond lengths. In the seventh O site, O is bonded in a 3-coordinate geometry to two equivalent Sr and one O atom. The O–O bond length is 1.38 Å. In the eighth O site, O is bonded in a single-bond geometry to one I atom. The O–I bond length is 1.81 Å. There are six inequivalent I sites. In the first I site, I is bonded in a distorted L-shaped geometry to four O atoms. In the second I site, I is bonded in a 3-coordinate geometry to three O atoms. In the third I site, I is bonded in a water-like geometry to two equivalent Cd atoms. In the fourth I site, I is bonded in a distorted rectangular see-saw-like geometry to four O atoms. In the fifth I site, I is bonded in a water-like geometry to two equivalent Cd atoms. In the sixth I site, I is bonded in a 4-coordinate geometry to four O atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La2Si(IO2)2 by Materials Project

La2Si(O2I)2 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two La2Si(O2I)2 sheets oriented in the (0, 0, 1) direction. there are four inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 8-coordinate geometry to five O2- and three I1- atoms. There are a spread of La–O bond distances ranging from 2.39–2.66 Å. There are a spread of La–I bond distances ranging from 3.33–3.39 Å. In the second La3+ site, La3+ is bonded in a 8-coordinate geometry to five O2- and three I1- atoms. There are a spread of La–O bond distances ranging from 2.41–2.67 Å. There are two shorter (3.33 Å) and one longer (3.38 Å) La–I bond lengths. In the third La3+ site, La3+ is bonded in a 9-coordinate geometry to seven O2- and two I1- atoms. There are a spread of La–O bond distances ranging from 2.40–2.96 Å. There are one shorter (3.31 Å) and one longer (3.49 Å) La–I bond lengths. In the fourth La3+ site, La3+ is bonded in a 9-coordinate geometry to seven O2- and two I1- atoms. There are a spread of La–O bond distances ranging from 2.41–2.98 Å. There are one shorter (3.29 Å) and one longer (3.50 Å) La–I bond lengths. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. In the second Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Si4+ atom. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a 2-coordinate geometry to two La3+ atoms. In the second I1- site, I1- is bonded in a 2-coordinate geometry to two La3+ atoms. In the third I1- site, I1- is bonded in a 3-coordinate geometry to three La3+ atoms. In the fourth I1- site, I1- is bonded in a 3-coordinate geometry to three La3+ atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1980

Photosensitized oxidation of unsaturated polymers

A review of the photosensitized oxidation of singlet oxygenation of unsaturated hydrocarbon polymers and of their model compounds is presented. The cis and trans forms of 1,4-polyisoprene, 1,4-polybutadiene and 1,2-poly(1,4-hexadiene) are studied, and their microstructural changes which occur on reaction with (IO2) in solution were investigated by infrared, (H-1) and (C-13) NMR spectroscopy. The polymers yielded allylic hydroperoxides with shifted double bonds according to the 'ene' mechanism of simple olefins. It was shown that single oxygenation of unsaturated polymers is similar to their low molecular weight analogs, and that the differences are due to secondary processes affecting the (IO2)-reacted polymers.

Golub, M. A.↗
NASA NTRS2003

Effects of the oral contraceptive pill cycle on physiological responses to hypoxic exercise

To test whether the oral contraceptive pill cycle affects endocrine and metabolic responses to hypoxic (fraction of inspired oxygen = 13%, P(IO2): 95 mmHg; H) versus normoxic (P(IO2):153 mmHg; N) exercise, we examined eight women (28 +/- 1.2 yr) during the third (PILL) and placebo (PLA) weeks of their monthly oral contraceptive pill cycle. Cardiopulmonary, metabolic, and neuroendocrine measurements were taken before, during, and after three 5-min consecutive workloads at 30%, 45%, and 60% of normoxic V(O2peak) in H and N trials. Heart rate response to exercise was greater in H versus N, but was not different between PILL and PLA. Lactate levels were significantly greater during exercise, and both lactate and glucose levels were significantly greater for 30 min after exercise in H versus N (p < 0.0001). When expressed relative to baseline, lactate levels were lower in PILL versus PLA, but glucose was greater in PILL versus PLA (p < 0.001). Cortisol levels were also significantly greater in PILL versus PLA (p < 0.001). Norepinephrine levels were significantly increased during exercise (p < 0.0001) and in H versus N (p < 0.0001). However, epinephrine levels were not different over time or with trial. Thus, the presence of circulating estradiol and progesterone during the PILL phase reduces glucose and lactate responses to hypoxic exercise.

Non-NASA Center↗