CaHo(BiO3)2 crystallizes in the orthorhombic Pmn2_1 space group. Ca(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(3) atoms. Ho(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. Bi(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 42-51°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ho(1), and two equivalent Bi(1) atoms to form distorted corner-sharing OCaHoBi2 trigonal pyramids. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ho(1) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded to one Ca(1), one Ho(1), and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OCaHoBi2 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one Ho(1), and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OCaHoBi2 trigonal pyramids.
CaHo(BiO3)2 crystallizes in the orthorhombic Pmn2_1 space group. Ca(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(3) atoms. The Ca(1)-O(1) bond length is 2.57 Å. The Ca(1)-O(4) bond length is 2.27 Å. Both Ca(1)-O(3) bond lengths are 2.37 Å. Ho(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Ho(1)-O(1) bond length is 2.27 Å. The Ho(1)-O(4) bond length is 2.32 Å. Both Ho(1)-O(2) bond lengths are 2.24 Å. Both Ho(1)-O(3) bond lengths are 2.54 Å. Bi(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 42-51°. The Bi(1)-O(1) bond length is 2.37 Å. The Bi(1)-O(4) bond length is 2.36 Å. There is one shorter (2.29 Å) and one longer (2.30 Å) Bi(1)-O(2) bond length. There is one shorter (2.27 Å) and one longer (2.29 Å) Bi(1)-O(3) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ho(1), and two equivalent Bi(1) atoms to form distorted corner-sharing OCaHoBi2 trigonal pyramids. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ho(1) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded to one Ca(1), one Ho(1), and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OCaHoBi2 tetrahedra. In the fourth O site, O(4) is bonded to one Ca(1), one Ho(1), and two equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing OCaHoBi2 trigonal pyramids.