Materials Data on Rb2Na2SiO4 by Materials Project
Rb2Na2SiO4 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Rb–O bond distances ranging from 2.80–2.96 Å. In the second Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Rb–O bond distances ranging from 2.90–3.13 Å. There are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to four O2- atoms to form distorted NaO4 tetrahedra that share corners with two equivalent SiO4 tetrahedra and an edgeedge with one SiO4 tetrahedra. There are three shorter (2.34 Å) and one longer (2.41 Å) Na–O bond lengths. In the second Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Na–O bond distances ranging from 2.38–2.64 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent NaO4 tetrahedra and an edgeedge with one NaO4 tetrahedra. There is two shorter (1.67 Å) and two longer (1.68 Å) Si–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Rb1+, three Na1+, and one Si4+ atom. In the second O2- site, O2- is bonded in a 6-coordinate geometry to three Rb1+, two Na1+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 6-coordinate geometry to three Rb1+, two Na1+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Rb1+, two Na1+, and one Si4+ atom.