DOI: 10.17188/1709555
title: Materials Data on RbNa2Al3Ge3O13 by Materials Project

description: Rb2O2(Na2Al3(GeO4)3)2 crystallizes in the monoclinic Pc space group. The structure is three-dimensional and consists of two Rb2O2 ribbons oriented in the (1, 0, 0) direction and one Na2Al3(GeO4)3 framework. In each Rb2O2 ribbon, Rb is bonded in a 2-coordinate geometry to two equivalent O atoms. There are one shorter (2.87 Å) and one longer (2.89 Å) Rb–O bond lengths. O is bonded in a bent 150 degrees geometry to two equivalent Rb atoms. In the Na2Al3(GeO4)3 framework, there are two inequivalent Na sites. In the first Na site, Na is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Na–O bond distances ranging from 2.37–2.57 Å. In the second Na site, Na is bonded in a 5-coordinate geometry to seven O atoms. There are a spread of Na–O bond distances ranging from 2.38–2.92 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with four GeO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.74–1.78 Å. In the second Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with four GeO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.74–1.77 Å. In the third Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with four GeO4 tetrahedra. There is one shorter (1.76 Å) and three longer (1.77 Å) Al–O bond length. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with four AlO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.74–1.78 Å. In the second Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with four AlO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.74–1.77 Å. In the third Ge site, Ge is bonded to four O atoms to form GeO4 tetrahedra that share corners with four AlO4 tetrahedra. All Ge–O bond lengths are 1.76 Å. There are twelve inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to one Na, one Al, and one Ge atom. In the second O site, O is bonded in a 2-coordinate geometry to one Na, one Al, and one Ge atom. In the third O site, O is bonded in a 2-coordinate geometry to one Na, one Al, and one Ge atom. In the fourth O site, O is bonded in a 3-coordinate geometry to one Na, one Al, and one Ge atom. In the fifth O site, O is bonded in a 3-coordinate geometry to two Na, one Al, and one Ge atom. In the sixth O site, O is bonded in a 3-coordinate geometry to two Na, one Al, and one Ge atom. In the seventh O site, O is bonded in a trigonal planar geometry to one Na, one Al, and one Ge atom. In the eighth O site, O is bonded in a bent 150 degrees geometry to one Al and one Ge atom. In the ninth O site, O is bonded in a distorted bent 150 degrees geometry to one Al and one Ge atom. In the tenth O site, O is bonded in a trigonal planar geometry to one Na, one Al, and one Ge atom. In the eleventh O site, O is bonded in a 3-coordinate geometry to one Na, one Al, and one Ge atom. In the twelfth O site, O is bonded in a 3-coordinate geometry to one Na, one Al, and one Ge atom.