BaCa(CO3)2 crystallizes in the monoclinic P2_1 space group. Ba(1) is bonded in a 11-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(6) atoms. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(5) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Ca(1), and one C(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Ca(1), and one C(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Ca(1), and one C(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(1), two equivalent Ca(1), and one C(1) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Ba(1), two equivalent Ca(1), and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one C(2) atom.
BaCa(CO3)2 crystallizes in the monoclinic P2_1 space group. Ba(1) is bonded in a 11-coordinate geometry to one O(4), one O(5), two equivalent O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(6) atoms. The Ba(1)-O(4) bond length is 3.26 Å. The Ba(1)-O(5) bond length is 2.79 Å. There is one shorter (2.98 Å) and one longer (3.32 Å) Ba(1)-O(1) bond length. There is one shorter (2.86 Å) and one longer (2.95 Å) Ba(1)-O(2) bond length. There is one shorter (2.81 Å) and one longer (3.24 Å) Ba(1)-O(3) bond length. There are a spread of Ba(1)-O(6) bond distances ranging from 2.72-3.00 Å. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. The Ca(1)-O(1) bond length is 2.41 Å. The Ca(1)-O(2) bond length is 2.35 Å. The Ca(1)-O(3) bond length is 2.32 Å. There is one shorter (2.35 Å) and one longer (2.47 Å) Ca(1)-O(4) bond length. There is one shorter (2.36 Å) and one longer (2.89 Å) Ca(1)-O(5) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(5) atom. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(4) bond length is 1.31 Å. The C(1)-O(5) bond length is 1.31 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(6) atom. The C(2)-O(2) bond length is 1.31 Å. The C(2)-O(3) bond length is 1.30 Å. The C(2)-O(6) bond length is 1.29 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Ca(1), and one C(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Ca(1), and one C(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent Ba(1), one Ca(1), and one C(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(1), two equivalent Ca(1), and one C(1) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Ba(1), two equivalent Ca(1), and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to three equivalent Ba(1) and one C(2) atom.