Materials Data on Na2ScSiO5 by Materials Project

Abstract

Na2ScSiO5 crystallizes in the orthorhombic Pca2_1 space group. The structure is three-dimensional. there are four inequivalent Na sites. In the first Na site, Na is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.35–2.79 Å. In the second Na site, Na is bonded in a 5-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.35–2.85 Å. In the third Na site, Na is bonded in a 5-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.34–2.90 Å. In the fourth Na site, Na is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.36–2.74 Å. There are two inequivalent Sc sites. In the first Sc site, Sc is bonded to six O atoms to form ScO6 octahedra that share corners with two equivalent ScO6 octahedra and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 24–26°. There are a spread of Sc–O bond distances ranging from 2.07–2.15 Å. In the second Sc site, Sc is bonded to six O atoms to form ScO6 octahedra that share corners with two equivalent ScO6 octahedra and corners with four SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 24–26°. There are a spread of Sc–O bond distances ranging from 2.07–2.16 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four ScO6 octahedra. The corner-sharing octahedra tilt angles range from 33–51°. There are a spread of Si–O bond distances ranging from 1.64–1.66 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four ScO6 octahedra. The corner-sharing octahedra tilt angles range from 30–51°. There are a spread of Si–O bond distances ranging from 1.64–1.67 Å. There are ten inequivalent O sites. In the first O site, O is bonded in a distorted rectangular see-saw-like geometry to two Na, one Sc, and one Si atom. In the second O site, O is bonded in a 6-coordinate geometry to four Na and two Sc atoms. In the third O site, O is bonded in a 4-coordinate geometry to two Na, one Sc, and one Si atom. In the fourth O site, O is bonded in a 6-coordinate geometry to four Na and two Sc atoms. In the fifth O site, O is bonded in a 4-coordinate geometry to two Na, one Sc, and one Si atom. In the sixth O site, O is bonded in a distorted tetrahedral geometry to two Na, one Sc, and one Si atom. In the seventh O site, O is bonded in a distorted tetrahedral geometry to two Na, one Sc, and one Si atom. In the eighth O site, O is bonded in a 4-coordinate geometry to two Na, one Sc, and one Si atom. In the ninth O site, O is bonded in a 4-coordinate geometry to two Na, one Sc, and one Si atom. In the tenth O site, O is bonded in a distorted rectangular see-saw-like geometry to two Na, one Sc, and one Si atom.