BaP10 crystallizes in the orthorhombic Cmc2_1 space group. Ba(1) is bonded in a 12-coordinate geometry to one P(2), one P(3), one P(5), one P(6), two equivalent P(1), two equivalent P(4), two equivalent P(7), and two equivalent P(8) atoms. There are eight inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Ba(1), one P(3), and one P(6) atom to form PBa2P2 tetrahedra that share corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with two equivalent P(6)BaP3 tetrahedra, corners with six equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, corners with six equivalent P(7)BaP3 trigonal pyramids, and  an edgeedge with one P(4)Ba2P2 trigonal pyramid. In the second P site, P(2) is bonded to one Ba(1), one P(4), and two equivalent P(7) atoms to form PBaP3 tetrahedra that share corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with three equivalent P(6)BaP3 tetrahedra, corners with four equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, and corners with two equivalent P(7)BaP3 trigonal pyramids. In the third P site, P(3) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one P(1), and two equivalent P(8) atoms. In the fourth P site, P(4) is bonded to two equivalent Ba(1), one P(2), and one P(5) atom to form distorted PBa2P2 trigonal pyramids that share corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with two equivalent P(6)BaP3 tetrahedra, corners with six equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, corners with two equivalent P(7)BaP3 trigonal pyramids,  an edgeedge with one P(1)Ba2P2 tetrahedra, and edges with two equivalent P(7)BaP3 trigonal pyramids. In the fifth P site, P(5) is bonded to one Ba(1), one P(4), and two equivalent P(8) atoms to form PBaP3 tetrahedra that share  a cornercorner with one P(6)BaP3 tetrahedra, corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, and corners with four equivalent P(7)BaP3 trigonal pyramids. In the sixth P site, P(6) is bonded to one Ba(1), one P(1), and two equivalent P(7) atoms to form distorted PBaP3 tetrahedra that share  a cornercorner with one P(5)BaP3 tetrahedra, corners with two equivalent P(1)Ba2P2 tetrahedra, corners with three equivalent P(2)BaP3 tetrahedra, corners with four equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, and corners with two equivalent P(7)BaP3 trigonal pyramids. In the seventh P site, P(7) is bonded to one Ba(1), one P(2), one P(6), and one P(8) atom to form distorted PBaP3 trigonal pyramids that share  a cornercorner with one P(2)BaP3 tetrahedra,  a cornercorner with one P(6)BaP3 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with two equivalent P(8)BaP3 tetrahedra, corners with three equivalent P(1)Ba2P2 tetrahedra,  a cornercorner with one P(4)Ba2P2 trigonal pyramid,  a cornercorner with one P(7)BaP3 trigonal pyramid,  an edgeedge with one P(4)Ba2P2 trigonal pyramid, and  an edgeedge with one P(7)BaP3 trigonal pyramid. In the eighth P site, P(8) is bonded to one Ba(1), one P(3), one P(5), and one P(7) atom to form PBaP3 tetrahedra that share  a cornercorner with one P(5)BaP3 tetrahedra,  a cornercorner with one P(8)BaP3 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(6)BaP3 tetrahedra, corners with three equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(7)BaP3 trigonal pyramids, corners with three equivalent P(4)Ba2P2 trigonal pyramids, and  an edgeedge with one P(8)BaP3 tetrahedra.
BaP10 crystallizes in the orthorhombic Cmc2_1 space group. Ba(1) is bonded in a 12-coordinate geometry to one P(2), one P(3), one P(5), one P(6), two equivalent P(1), two equivalent P(4), two equivalent P(7), and two equivalent P(8) atoms. The Ba(1)-P(2) bond length is 3.35 Å. The Ba(1)-P(3) bond length is 3.94 Å. The Ba(1)-P(5) bond length is 3.56 Å. The Ba(1)-P(6) bond length is 3.44 Å. Both Ba(1)-P(1) bond lengths are 3.60 Å. Both Ba(1)-P(4) bond lengths are 3.74 Å. Both Ba(1)-P(7) bond lengths are 3.50 Å. Both Ba(1)-P(8) bond lengths are 3.54 Å. There are eight inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Ba(1), one P(3), and one P(6) atom to form PBa2P2 tetrahedra that share corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with two equivalent P(6)BaP3 tetrahedra, corners with six equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, corners with six equivalent P(7)BaP3 trigonal pyramids, and  an edgeedge with one P(4)Ba2P2 trigonal pyramid. The P(1)-P(3) bond length is 2.15 Å. The P(1)-P(6) bond length is 2.14 Å. In the second P site, P(2) is bonded to one Ba(1), one P(4), and two equivalent P(7) atoms to form PBaP3 tetrahedra that share corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with three equivalent P(6)BaP3 tetrahedra, corners with four equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, and corners with two equivalent P(7)BaP3 trigonal pyramids. The P(2)-P(4) bond length is 2.20 Å. Both P(2)-P(7) bond lengths are 2.22 Å. In the third P site, P(3) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one P(1), and two equivalent P(8) atoms. Both P(3)-P(8) bond lengths are 2.22 Å. In the fourth P site, P(4) is bonded to two equivalent Ba(1), one P(2), and one P(5) atom to form distorted PBa2P2 trigonal pyramids that share corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with two equivalent P(6)BaP3 tetrahedra, corners with six equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, corners with two equivalent P(7)BaP3 trigonal pyramids,  an edgeedge with one P(1)Ba2P2 tetrahedra, and edges with two equivalent P(7)BaP3 trigonal pyramids. The P(4)-P(5) bond length is 2.18 Å. In the fifth P site, P(5) is bonded to one Ba(1), one P(4), and two equivalent P(8) atoms to form PBaP3 tetrahedra that share  a cornercorner with one P(6)BaP3 tetrahedra, corners with two equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, and corners with four equivalent P(7)BaP3 trigonal pyramids. Both P(5)-P(8) bond lengths are 2.22 Å. In the sixth P site, P(6) is bonded to one Ba(1), one P(1), and two equivalent P(7) atoms to form distorted PBaP3 tetrahedra that share  a cornercorner with one P(5)BaP3 tetrahedra, corners with two equivalent P(1)Ba2P2 tetrahedra, corners with three equivalent P(2)BaP3 tetrahedra, corners with four equivalent P(8)BaP3 tetrahedra, corners with two equivalent P(4)Ba2P2 trigonal pyramids, and corners with two equivalent P(7)BaP3 trigonal pyramids. Both P(6)-P(7) bond lengths are 2.20 Å. In the seventh P site, P(7) is bonded to one Ba(1), one P(2), one P(6), and one P(8) atom to form distorted PBaP3 trigonal pyramids that share  a cornercorner with one P(2)BaP3 tetrahedra,  a cornercorner with one P(6)BaP3 tetrahedra, corners with two equivalent P(5)BaP3 tetrahedra, corners with two equivalent P(8)BaP3 tetrahedra, corners with three equivalent P(1)Ba2P2 tetrahedra,  a cornercorner with one P(4)Ba2P2 trigonal pyramid,  a cornercorner with one P(7)BaP3 trigonal pyramid,  an edgeedge with one P(4)Ba2P2 trigonal pyramid, and  an edgeedge with one P(7)BaP3 trigonal pyramid. The P(7)-P(8) bond length is 2.24 Å. In the eighth P site, P(8) is bonded to one Ba(1), one P(3), one P(5), and one P(7) atom to form PBaP3 tetrahedra that share  a cornercorner with one P(5)BaP3 tetrahedra,  a cornercorner with one P(8)BaP3 tetrahedra, corners with two equivalent P(2)BaP3 tetrahedra, corners with two equivalent P(6)BaP3 tetrahedra, corners with three equivalent P(1)Ba2P2 tetrahedra, corners with two equivalent P(7)BaP3 trigonal pyramids, corners with three equivalent P(4)Ba2P2 trigonal pyramids, and  an edgeedge with one P(8)BaP3 tetrahedra.