Materials Data on CsSiSbO5 by Materials Project
CsSiSbO5 crystallizes in the orthorhombic Ama2 space group. The structure is three-dimensional. there are three inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cs–O bond distances ranging from 2.89–3.21 Å. In the second Cs1+ site, Cs1+ is bonded to six O2- atoms to form CsO6 octahedra that share corners with eight SbO6 octahedra and corners with four SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 67°. There are four shorter (3.10 Å) and two longer (3.18 Å) Cs–O bond lengths. In the third Cs1+ site, Cs1+ is bonded in a 2-coordinate geometry to two equivalent O2- atoms. Both Cs–O bond lengths are 2.88 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one CsO6 octahedra, corners with two SbO6 octahedra, and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 44–83°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one CsO6 octahedra, corners with two SbO6 octahedra, and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 44–83°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. There are two inequivalent Sb5+ sites. In the first Sb5+ site, Sb5+ is bonded to six O2- atoms to form SbO6 octahedra that share corners with two equivalent CsO6 octahedra, corners with four SbO6 octahedra, and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 41–67°. There are a spread of Sb–O bond distances ranging from 1.96–2.05 Å. In the second Sb5+ site, Sb5+ is bonded to six O2- atoms to form SbO6 octahedra that share corners with two equivalent CsO6 octahedra, corners with four SbO6 octahedra, and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 41–67°. There are a spread of Sb–O bond distances ranging from 1.96–2.05 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Cs1+ and two Sb5+ atoms. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Si4+ atoms. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Si4+ atoms. In the fourth O2- site, O2- is bonded in a distorted linear geometry to one Cs1+ and two Si4+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Cs1+ and two Sb5+ atoms. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Cs1+ and two equivalent Sb5+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one Cs1+ and two equivalent Sb5+ atoms. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to one Cs1+, one Si4+, and one Sb5+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one Cs1+, one Si4+, and one Sb5+ atom. In the tenth O2- site, O2- is bonded in a 2-coordinate geometry to one Cs1+, one Si4+, and one Sb5+ atom. In the eleventh O2- site, O2- is bonded in a 2-coordinate geometry to one Cs1+, one Si4+, and one Sb5+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to one Cs1+ and two Sb5+ atoms.