Bi6P2O15 crystallizes in the orthorhombic Ccc2 space group. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), one O(7), and two equivalent O(8) atoms to form a mixture of distorted edge and corner-sharing BiO5 square pyramids. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms. In the third Bi site, Bi(3) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(6), and two equivalent O(7) atoms. P(1) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(5), and one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Bi(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Bi(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Bi(3) and one P(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Bi(1) and two equivalent Bi(3) atoms. In the eighth O site, O(8) is bonded to four equivalent Bi(1) atoms to form edge-sharing OBi4 tetrahedra.
Bi6P2O15 crystallizes in the orthorhombic Ccc2 space group. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), one O(7), and two equivalent O(8) atoms to form a mixture of distorted edge and corner-sharing BiO5 square pyramids. The Bi(1)-O(1) bond length is 2.26 Å. The Bi(1)-O(2) bond length is 2.37 Å. The Bi(1)-O(7) bond length is 2.30 Å. There is one shorter (2.19 Å) and one longer (2.62 Å) Bi(1)-O(8) bond length. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms. The Bi(2)-O(1) bond length is 2.17 Å. The Bi(2)-O(3) bond length is 2.40 Å. The Bi(2)-O(4) bond length is 2.54 Å. The Bi(2)-O(5) bond length is 2.72 Å. There is one shorter (2.20 Å) and one longer (2.24 Å) Bi(2)-O(2) bond length. In the third Bi site, Bi(3) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(6), and two equivalent O(7) atoms. The Bi(3)-O(1) bond length is 2.29 Å. There is one shorter (2.39 Å) and one longer (2.77 Å) Bi(3)-O(6) bond length. There is one shorter (2.13 Å) and one longer (2.20 Å) Bi(3)-O(7) bond length. P(1) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(5), and one O(6) atom. The P(1)-O(3) bond length is 1.58 Å. The P(1)-O(4) bond length is 1.56 Å. The P(1)-O(5) bond length is 1.55 Å. The P(1)-O(6) bond length is 1.55 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Bi(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Bi(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Bi(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Bi(3) and one P(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Bi(1) and two equivalent Bi(3) atoms. In the eighth O site, O(8) is bonded to four equivalent Bi(1) atoms to form edge-sharing OBi4 tetrahedra.