Materials Data on CaSmGa3O7 by Materials Project
CaSmGa3O7 crystallizes in the orthorhombic Cmm2 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 2.43–2.95 Å. Sm3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sm–O bond distances ranging from 2.39–2.86 Å. There are three inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded to four O2- atoms to form corner-sharing GaO4 tetrahedra. All Ga–O bond lengths are 1.85 Å. In the second Ga3+ site, Ga3+ is bonded to four O2- atoms to form distorted corner-sharing GaO4 trigonal pyramids. There are a spread of Ga–O bond distances ranging from 1.82–1.87 Å. In the third Ga3+ site, Ga3+ is bonded to four O2- atoms to form distorted corner-sharing GaO4 tetrahedra. There are a spread of Ga–O bond distances ranging from 1.81–1.88 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to one Ca2+, two equivalent Sm3+, and one Ga3+ atom to form distorted OCaSm2Ga tetrahedra that share corners with six OCa2SmGa tetrahedra and edges with two OSm2Ga2 tetrahedra. In the second O2- site, O2- is bonded to two equivalent Ca2+, one Sm3+, and one Ga3+ atom to form distorted OCa2SmGa tetrahedra that share corners with six OCaSm2Ga tetrahedra and edges with two OCa2Ga2 tetrahedra. In the third O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Ga3+ atoms to form distorted OCa2Ga2 tetrahedra that share corners with four OCaSm2Ga tetrahedra and edges with two equivalent OCa2SmGa tetrahedra. In the fourth O2- site, O2- is bonded to two equivalent Sm3+ and two equivalent Ga3+ atoms to form a mixture of distorted edge and corner-sharing OSm2Ga2 tetrahedra. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+, one Sm3+, and two Ga3+ atoms. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Sm3+, and two Ga3+ atoms.