CsBeAsO4 crystallizes in the orthorhombic Pna2_1 space group. Cs(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(3), three equivalent O(2), and three equivalent O(4) atoms. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form BeO4 tetrahedra that share corners with four equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Be(1), and one As(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Be(1), and one As(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Be(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Be(1), and one As(1) atom.
CsBeAsO4 crystallizes in the orthorhombic Pna2_1 space group. Cs(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(3), three equivalent O(2), and three equivalent O(4) atoms. There is one shorter (3.03 Å) and one longer (3.18 Å) Cs(1)-O(1) bond length. There is one shorter (3.10 Å) and one longer (3.33 Å) Cs(1)-O(3) bond length. There are a spread of Cs(1)-O(2) bond distances ranging from 3.03-3.65 Å. There are a spread of Cs(1)-O(4) bond distances ranging from 3.10-3.64 Å. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form BeO4 tetrahedra that share corners with four equivalent As(1)O4 tetrahedra. The Be(1)-O(1) bond length is 1.63 Å. The Be(1)-O(2) bond length is 1.64 Å. The Be(1)-O(3) bond length is 1.64 Å. The Be(1)-O(4) bond length is 1.64 Å. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra. The As(1)-O(1) bond length is 1.68 Å. The As(1)-O(2) bond length is 1.69 Å. The As(1)-O(3) bond length is 1.68 Å. The As(1)-O(4) bond length is 1.70 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Be(1), and one As(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Be(1), and one As(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Be(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Be(1), and one As(1) atom.