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DOE OSTI2020

Materials Data on CaPbI4 by Materials Project

CaPbI4 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one CaPbI4 sheet oriented in the (0, 0, 1) direction. Ca2+ is bonded to six I1- atoms to form CaI6 octahedra that share edges with two equivalent CaI6 octahedra and edges with four equivalent PbI6 octahedra. There are five shorter (3.18 Å) and one longer (3.19 Å) Ca–I bond lengths. Pb2+ is bonded to six I1- atoms to form PbI6 octahedra that share edges with two equivalent PbI6 octahedra and edges with four equivalent CaI6 octahedra. There are one shorter (3.27 Å) and five longer (3.28 Å) Pb–I bond lengths. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a 1-coordinate geometry to one Ca2+ and two equivalent Pb2+ atoms. In the second I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb2+ atom. In the third I1- site, I1- is bonded in a 1-coordinate geometry to one Ca2+ and two equivalent Pb2+ atoms. In the fourth I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaPbI4 by Materials Project

CaPbI4 crystallizes in the monoclinic P2/m space group. The structure is two-dimensional and consists of one CaPbI4 sheet oriented in the (1, 0, 0) direction. Ca2+ is bonded to six I1- atoms to form CaI6 octahedra that share edges with two equivalent CaI6 octahedra and edges with four equivalent PbI6 octahedra. All Ca–I bond lengths are 3.17 Å. Pb2+ is bonded to six I1- atoms to form PbI6 octahedra that share edges with two equivalent PbI6 octahedra and edges with four equivalent CaI6 octahedra. All Pb–I bond lengths are 3.26 Å. There are two inequivalent I1- sites. In the first I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and one Pb2+ atom. In the second I1- site, I1- is bonded in a 1-coordinate geometry to one Ca2+ and two equivalent Pb2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaPbI4 by Materials Project

CaPbI4 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Ca2+ is bonded to six I1- atoms to form CaI6 octahedra that share corners with eight equivalent PbI6 octahedra and edges with two equivalent CaI6 octahedra. The corner-sharing octahedra tilt angles range from 47–49°. There are four shorter (3.15 Å) and two longer (3.18 Å) Ca–I bond lengths. Pb2+ is bonded to six I1- atoms to form PbI6 octahedra that share corners with eight equivalent CaI6 octahedra and edges with two equivalent PbI6 octahedra. The corner-sharing octahedra tilt angles range from 47–49°. There are four shorter (3.24 Å) and two longer (3.27 Å) Pb–I bond lengths. There are two inequivalent I1- sites. In the first I1- site, I1- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Pb2+ atoms. In the second I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaPbI4 by Materials Project

CaPbI4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ca2+ is bonded to six I1- atoms to form CaI6 octahedra that share corners with two equivalent CaI6 octahedra, corners with three equivalent PbI6 octahedra, an edgeedge with one CaI6 octahedra, and edges with three equivalent PbI6 octahedra. The corner-sharing octahedra tilt angles range from 11–57°. There are a spread of Ca–I bond distances ranging from 3.06–3.26 Å. Pb2+ is bonded to six I1- atoms to form PbI6 octahedra that share corners with two equivalent PbI6 octahedra, corners with three equivalent CaI6 octahedra, an edgeedge with one PbI6 octahedra, and edges with three equivalent CaI6 octahedra. The corner-sharing octahedra tilt angles range from 11–59°. There are a spread of Pb–I bond distances ranging from 3.08–3.64 Å. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Pb2+ atoms. In the second I1- site, I1- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ca2+ and two equivalent Pb2+ atoms. In the third I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb2+ atom. In the fourth I1- site, I1- is bonded in a distorted L-shaped geometry to one Ca2+ and one Pb2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaPbI4 by Materials Project

CaPbI4 is trigonal omega-derived structured and crystallizes in the orthorhombic Pmn2_1 space group. The structure is two-dimensional and consists of two CaPbI4 sheets oriented in the (0, 1, 0) direction. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to six I1- atoms to form CaI6 octahedra that share edges with two equivalent PbI6 octahedra and edges with four CaI6 octahedra. There are two shorter (3.17 Å) and four longer (3.18 Å) Ca–I bond lengths. In the second Ca2+ site, Ca2+ is bonded to six I1- atoms to form CaI6 octahedra that share edges with two equivalent PbI6 octahedra and edges with four CaI6 octahedra. There are a spread of Ca–I bond distances ranging from 3.17–3.19 Å. There are two inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded to six I1- atoms to form PbI6 octahedra that share edges with two equivalent CaI6 octahedra and edges with four PbI6 octahedra. There are a spread of Pb–I bond distances ranging from 3.27–3.29 Å. In the second Pb2+ site, Pb2+ is bonded to six I1- atoms to form PbI6 octahedra that share edges with two equivalent CaI6 octahedra and edges with four PbI6 octahedra. There are a spread of Pb–I bond distances ranging from 3.27–3.30 Å. There are eight inequivalent I1- sites. In the first I1- site, I1- is bonded in a 3-coordinate geometry to three Pb2+ atoms. In the second I1- site, I1- is bonded in a distorted T-shaped geometry to three Ca2+ atoms. In the third I1- site, I1- is bonded in a distorted T-shaped geometry to three Ca2+ atoms. In the fourth I1- site, I1- is bonded in a 3-coordinate geometry to three Pb2+ atoms. In the fifth I1- site, I1- is bonded in a 1-coordinate geometry to one Ca2+ and two equivalent Pb2+ atoms. In the sixth I1- site, I1- is bonded in a 1-coordinate geometry to one Ca2+ and two equivalent Pb2+ atoms. In the seventh I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and one Pb2+ atom. In the eighth I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and one Pb2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaPbI6 by Materials Project

CaPbI6 crystallizes in the orthorhombic Fdd2 space group. The structure is three-dimensional. Ca2+ is bonded to five I1- atoms to form distorted CaI5 square pyramids that share corners with two equivalent PbI5 square pyramids, an edgeedge with one CaI5 square pyramid, and a faceface with one PbI5 square pyramid. There are a spread of Ca–I bond distances ranging from 3.05–3.20 Å. Pb4+ is bonded to five I1- atoms to form PbI5 square pyramids that share corners with two equivalent CaI5 square pyramids, corners with two equivalent PbI5 square pyramids, and a faceface with one CaI5 square pyramid. There are a spread of Pb–I bond distances ranging from 2.98–3.35 Å. There are six inequivalent I1- sites. In the first I1- site, I1- is bonded in a distorted single-bond geometry to one Ca2+ and one I1- atom. The I–I bond length is 2.93 Å. In the second I1- site, I1- is bonded in a distorted L-shaped geometry to one Ca2+ and one Pb4+ atom. In the third I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and one Pb4+ atom. In the fourth I1- site, I1- is bonded in a distorted linear geometry to two I1- atoms. The I–I bond length is 2.92 Å. In the fifth I1- site, I1- is bonded in a 2-coordinate geometry to one Pb4+ and one I1- atom. In the sixth I1- site, I1- is bonded in a 1-coordinate geometry to one Ca2+ and two equivalent Pb4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca3Pb3I14 by Materials Project

Ca3Pb3I14 crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of two Ca3Pb3I14 sheets oriented in the (-1, 0, 1) direction. there are three inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight I1- atoms. There are a spread of Ca–I bond distances ranging from 3.14–3.76 Å. In the second Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight I1- atoms. There are a spread of Ca–I bond distances ranging from 3.15–3.60 Å. In the third Ca2+ site, Ca2+ is bonded to six I1- atoms to form CaI6 octahedra that share edges with two equivalent CaI6 octahedra and edges with four PbI6 octahedra. There are a spread of Ca–I bond distances ranging from 3.15–3.19 Å. There are three inequivalent Pb+2.67+ sites. In the first Pb+2.67+ site, Pb+2.67+ is bonded to six I1- atoms to form PbI6 octahedra that share edges with two equivalent CaI6 octahedra and edges with two equivalent PbI6 octahedra. There are a spread of Pb–I bond distances ranging from 3.18–3.30 Å. In the second Pb+2.67+ site, Pb+2.67+ is bonded to six I1- atoms to form edge-sharing PbI6 octahedra. There are a spread of Pb–I bond distances ranging from 3.15–3.19 Å. In the third Pb+2.67+ site, Pb+2.67+ is bonded to six I1- atoms to form PbI6 octahedra that share edges with two equivalent CaI6 octahedra and edges with two equivalent PbI6 octahedra. There are a spread of Pb–I bond distances ranging from 3.17–3.26 Å. There are fourteen inequivalent I1- sites. In the first I1- site, I1- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Pb+2.67+ atoms. In the second I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb+2.67+ atom. In the third I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb+2.67+ atom. In the fourth I1- site, I1- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Pb+2.67+ atoms. In the fifth I1- site, I1- is bonded in an L-shaped geometry to two equivalent Ca2+ atoms. In the sixth I1- site, I1- is bonded in an L-shaped geometry to two equivalent Ca2+ atoms. In the seventh I1- site, I1- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Pb+2.67+ atoms. In the eighth I1- site, I1- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Pb+2.67+ atoms. In the ninth I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and one Pb+2.67+ atom. In the tenth I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb+2.67+ atom. In the eleventh I1- site, I1- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and one Pb+2.67+ atom. In the twelfth I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one Pb+2.67+ atom. In the thirteenth I1- site, I1- is bonded in a 1-coordinate geometry to one Ca2+ and two equivalent Pb+2.67+ atoms. In the fourteenth I1- site, I1- is bonded in a 3-coordinate geometry to one Ca2+ and two equivalent Pb+2.67+ atoms.

36 MATERIALS SCIENCE↗