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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on ErAlAg2 by Materials Project

ErAg2Al is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Er is bonded in a body-centered cubic geometry to eight equivalent Ag atoms. All Er–Ag bond lengths are 2.95 Å. Ag is bonded in a body-centered cubic geometry to four equivalent Er and four equivalent Al atoms. All Ag–Al bond lengths are 2.95 Å. Al is bonded in a distorted body-centered cubic geometry to eight equivalent Ag atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlAgS2 by Materials Project

AgAlS2 is Chalcopyrite structured and crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Ag1+ is bonded to four equivalent S2- atoms to form AgS4 tetrahedra that share corners with four equivalent AgS4 tetrahedra and corners with eight equivalent AlS4 tetrahedra. All Ag–S bond lengths are 2.58 Å. Al3+ is bonded to four equivalent S2- atoms to form AlS4 tetrahedra that share corners with four equivalent AlS4 tetrahedra and corners with eight equivalent AgS4 tetrahedra. All Al–S bond lengths are 2.28 Å. S2- is bonded to two equivalent Ag1+ and two equivalent Al3+ atoms to form corner-sharing SAl2Ag2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al(Ag3S2)3 by Materials Project

Ag9AlS6 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are nine inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Ag–S bond distances ranging from 2.51–2.71 Å. In the second Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Ag–S bond distances ranging from 2.52–2.78 Å. In the third Ag1+ site, Ag1+ is bonded in a 2-coordinate geometry to three S2- atoms. There are a spread of Ag–S bond distances ranging from 2.47–3.11 Å. In the fourth Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three S2- atoms. There are one shorter (2.51 Å) and two longer (2.68 Å) Ag–S bond lengths. In the fifth Ag1+ site, Ag1+ is bonded in a 2-coordinate geometry to three S2- atoms. There are a spread of Ag–S bond distances ranging from 2.46–2.92 Å. In the sixth Ag1+ site, Ag1+ is bonded in a distorted bent 150 degrees geometry to three S2- atoms. There are a spread of Ag–S bond distances ranging from 2.46–3.25 Å. In the seventh Ag1+ site, Ag1+ is bonded in a 2-coordinate geometry to three S2- atoms. There are a spread of Ag–S bond distances ranging from 2.48–2.95 Å. In the eighth Ag1+ site, Ag1+ is bonded in a distorted linear geometry to two S2- atoms. There are one shorter (2.41 Å) and one longer (2.47 Å) Ag–S bond lengths. In the ninth Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Ag–S bond distances ranging from 2.54–2.61 Å. Al3+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Al–S bond distances ranging from 2.24–2.30 Å. There are six inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to four Ag1+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to four Ag1+ and one Al3+ atom. In the third S2- site, S2- is bonded in a distorted see-saw-like geometry to three Ag1+ and one Al3+ atom. In the fourth S2- site, S2- is bonded in a 5-coordinate geometry to four Ag1+ and one Al3+ atom. In the fifth S2- site, S2- is bonded in a 7-coordinate geometry to six Ag1+ and one Al3+ atom. In the sixth S2- site, S2- is bonded in a 5-coordinate geometry to five Ag1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlAgS2 by Materials Project

AgAlS2 is Ilmenite-like structured and crystallizes in the trigonal P3m1 space group. The structure is three-dimensional. Ag1+ is bonded in a 4-coordinate geometry to four S2- atoms. There are one shorter (2.45 Å) and three longer (2.73 Å) Ag–S bond lengths. Al3+ is bonded to six S2- atoms to form edge-sharing AlS6 octahedra. There are three shorter (2.39 Å) and three longer (2.48 Å) Al–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to one Ag1+ and three equivalent Al3+ atoms to form distorted SAl3Ag trigonal pyramids that share corners with six equivalent SAl3Ag3 octahedra, corners with six equivalent SAl3Ag trigonal pyramids, and edges with three equivalent SAl3Ag3 octahedra. The corner-sharing octahedra tilt angles range from 3–49°. In the second S2- site, S2- is bonded to three equivalent Ag1+ and three equivalent Al3+ atoms to form SAl3Ag3 octahedra that share corners with six equivalent SAl3Ag trigonal pyramids, edges with six equivalent SAl3Ag3 octahedra, and edges with three equivalent SAl3Ag trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlAgS2 by Materials Project

AgAlS2 is Ilmenite-like structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. Ag1+ is bonded in a 4-coordinate geometry to four S2- atoms. There are one shorter (2.43 Å) and three longer (2.77 Å) Ag–S bond lengths. Al3+ is bonded to six S2- atoms to form edge-sharing AlS6 octahedra. There are three shorter (2.40 Å) and three longer (2.47 Å) Al–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to one Ag1+ and three equivalent Al3+ atoms to form distorted corner-sharing SAl3Ag trigonal pyramids. In the second S2- site, S2- is bonded in a 6-coordinate geometry to three equivalent Ag1+ and three equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗