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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ca2PI by Materials Project

Ca2PI is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ca2+ is bonded to three equivalent P3- and three equivalent I1- atoms to form a mixture of corner and edge-sharing CaP3I3 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ca–P bond lengths are 2.86 Å. All Ca–I bond lengths are 3.41 Å. P3- is bonded to six equivalent Ca2+ atoms to form PCa6 octahedra that share corners with six equivalent ICa6 octahedra, edges with six equivalent PCa6 octahedra, and edges with six equivalent ICa6 octahedra. The corner-sharing octahedral tilt angles are 14°. I1- is bonded to six equivalent Ca2+ atoms to form distorted ICa6 octahedra that share corners with six equivalent PCa6 octahedra, edges with six equivalent PCa6 octahedra, and edges with six equivalent ICa6 octahedra. The corner-sharing octahedral tilt angles are 14°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca2PI by Materials Project

Ca2PI crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 5-coordinate geometry to three equivalent P3- and two equivalent I1- atoms. There are two shorter (2.84 Å) and one longer (2.85 Å) Ca–P bond lengths. There are one shorter (3.33 Å) and one longer (3.40 Å) Ca–I bond lengths. In the second Ca2+ site, Ca2+ is bonded in a 6-coordinate geometry to three equivalent P3- and three equivalent I1- atoms. There are two shorter (2.85 Å) and one longer (2.86 Å) Ca–P bond lengths. There are a spread of Ca–I bond distances ranging from 3.37–3.66 Å. P3- is bonded to six Ca2+ atoms to form edge-sharing PCa6 octahedra. I1- is bonded in a 5-coordinate geometry to five Ca2+ atoms.

36 MATERIALS SCIENCE↗