MgBiAsO5 crystallizes in the orthorhombic P2_12_12_1 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(5) atoms. Bi(1) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(5), and two equivalent O(1) atoms. As(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Bi(1) and one As(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mg(1) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Bi(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Bi(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mg(1) and one Bi(1) atom.
MgBiAsO5 crystallizes in the orthorhombic P2_12_12_1 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(5) atoms. The Mg(1)-O(2) bond length is 1.98 Å. The Mg(1)-O(3) bond length is 2.09 Å. There is one shorter (2.00 Å) and one longer (2.06 Å) Mg(1)-O(5) bond length. Bi(1) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(5), and two equivalent O(1) atoms. The Bi(1)-O(3) bond length is 2.59 Å. The Bi(1)-O(4) bond length is 2.29 Å. The Bi(1)-O(5) bond length is 2.13 Å. There is one shorter (2.29 Å) and one longer (2.50 Å) Bi(1)-O(1) bond length. As(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The As(1)-O(1) bond length is 1.75 Å. The As(1)-O(2) bond length is 1.70 Å. The As(1)-O(3) bond length is 1.72 Å. The As(1)-O(4) bond length is 1.73 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Bi(1) and one As(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mg(1) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Bi(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Bi(1) and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mg(1) and one Bi(1) atom.