DOI: 10.17188/1697450
title: Materials Data on Na2Ca(CO3)2 by Materials Project

description: Na2Ca(CO3)2 crystallizes in the orthorhombic Pca2_1 space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.34–3.00 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.34–2.80 Å. In the third Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.34–2.96 Å. In the fourth Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.34–2.83 Å. There are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.71 Å. In the second Ca2+ site, Ca2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.69 Å. There are four inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.29 Å) and two longer (1.30 Å) C–O bond length. In the third C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.29–1.31 Å. In the fourth C4+ site, C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.29–1.31 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, two Ca2+, and one C4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two Na1+, two Ca2+, and one C4+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to two Na1+, two equivalent Ca2+, and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two Na1+, two Ca2+, and one C4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, one Ca2+, and one C4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, two Ca2+, and one C4+ atom. In the seventh O2- site, O2- is bonded in a 5-coordinate geometry to two Na1+, two equivalent Ca2+, and one C4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Ca2+, and one C4+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, one Ca2+, and one C4+ atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to three Na1+, one Ca2+, and one C4+ atom. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Ca2+, and one C4+ atom. In the twelfth O2- site, O2- is bonded in a distorted single-bond geometry to three Na1+, one Ca2+, and one C4+ atom.