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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.

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6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CaCd(NO3)4 by Materials Project

CaCd(NO3)4 crystallizes in the trigonal P3_121 space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.39–2.57 Å. Cd2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Cd–O bond distances ranging from 2.39–2.68 Å. There are two inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.22 Å) and one 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 are a spread of N–O bond distances ranging from 1.24–1.32 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ atom. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to one Ca2+, one Cd2+, and one N5+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Cd2+, and one N5+ atom. In the fourth O2- site, O2- is bonded in a distorted L-shaped geometry to one Cd2+ and one N5+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ and one N5+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Cd2+ and one N5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCd(CO3)2 by Materials Project

CaCd(CO3)2 is Calcite-derived structured and crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent O2- atoms to form CaO6 octahedra that share corners with six equivalent CdO6 octahedra. The corner-sharing octahedral tilt angles are 62°. All Ca–O bond lengths are 2.37 Å. Cd2+ is bonded to six equivalent O2- atoms to form CdO6 octahedra that share corners with six equivalent CaO6 octahedra. The corner-sharing octahedral tilt angles are 62°. All Cd–O bond lengths are 2.35 Å. C4+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All C–O bond lengths are 1.30 Å. O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one Cd2+, and one C4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCd(WO4)2 by Materials Project

CaCd(WO4)2 is Zircon-derived structured and crystallizes in the monoclinic C2 space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.43–2.51 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded in a tetrahedral geometry to four O2- atoms. All W–O bond lengths are 1.83 Å. In the second W6+ site, W6+ is bonded in a tetrahedral geometry to four O2- atoms. All W–O bond lengths are 1.83 Å. Cd2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Cd–O bond distances ranging from 2.42–2.51 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one W6+, and one Cd2+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one W6+, and one Cd2+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one W6+, and one Cd2+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+, one W6+, and one Cd2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCd(NO3)4 by Materials Project

CaCd(NO3)4 crystallizes in the trigonal P3_2 space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.43–2.54 Å. Cd2+ is bonded in a distorted hexagonal bipyramidal geometry to eight O2- atoms. There are a spread of Cd–O bond distances ranging from 2.42–2.65 Å. There are four inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.22 Å) and one longer (1.29 Å) N–O bond length. In the second N5+ site, N5+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.22 Å) and one longer (1.29 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 1.25–1.31 Å. In the fourth 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 1.25–1.31 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted L-shaped geometry to one Cd2+ and one N5+ atom. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to one Ca2+, one Cd2+, and one N5+ atom. In the third O2- site, O2- is bonded in a distorted T-shaped geometry to one Ca2+, one Cd2+, and one N5+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one Ca2+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one Ca2+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ and one N5+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to one Cd2+ and one N5+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ and one N5+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to one Cd2+ and one N5+ atom. In the tenth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Cd2+, and one N5+ atom. In the eleventh O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Cd2+, and one N5+ atom. In the twelfth O2- site, O2- is bonded in a distorted L-shaped geometry to one Cd2+ and one N5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaCd by Materials Project

CdCa is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ca is bonded in a body-centered cubic geometry to eight equivalent Cd atoms. All Ca–Cd bond lengths are 3.34 Å. Cd is bonded in a body-centered cubic geometry to eight equivalent Ca atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Map of the Zintl AM 2 Pn 2 Compounds: Influence of Chemistry on Stability and Electronic Structure

The AM 2 Pn 2 (A= Ca, Sr, Ba, Yb, Mg; M = Zn, Cd, Mg; and Pn = N, P, As, Sb, Bi) family of Zintl phases has been known as thermoelectric materials and has recently gained much attention for highly promising materials for solar absorbers in single-junction and tandem solar cells. In this paper, we will, from first principles, explore the entire family of AM 2 Pn 2 compounds in terms of their ground-state structure, thermodynamic stability, and electronic structure. We also perform photoluminescence spectroscopy on bulk powder and thin film samples to verify our results, including the first measurements of the band gaps of SrCd 2 P 2 and CaCd 2 P 2 . The AM 2 Pn 2 compounds exhibit broad stability, are mostly isostructural to CaAl 2 Si 2 (P$\overline{3}$m1), and cover a wide range of band gaps from 0 to beyond 3 eV. This could make them useful for a variety of purposes, for which we propose several candidates, such as CaZn 2 N 2 for tandem top cell solar absorbers and SrCd 2 Sb 2 and CaZn 2 Sb 2 for infrared detectors. By examining the band structures of the AM 2 Pn 2 , we find that Mg 3 Sb 2 has the most promise as a thermoelectric material due to several off-Γ valence band pockets, which are unique to it among the compositions studied here.

14 SOLAR ENERGY↗