OsP4 is Hausmannite-like structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to two equivalent P(1), two equivalent P(3), and two equivalent P(6) atoms to form OsP6 octahedra that share corners with four equivalent Os(2)P6 octahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, corners with two equivalent P(6)P3Os tetrahedra, corners with four equivalent P(4)P3Os tetrahedra, and corners with four equivalent P(5)P3Os tetrahedra. The corner-sharing octahedral tilt angles range from 54-56°. In the second Os site, Os(2) is bonded to one P(1), one P(3), one P(4), one P(5), and two equivalent P(2) atoms to form OsP6 octahedra that share corners with two equivalent Os(1)P6 octahedra,  a cornercorner with one P(3)P2Os2 tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(5)P3Os tetrahedra, corners with three equivalent P(4)P3Os tetrahedra, corners with four equivalent P(6)P3Os tetrahedra, and  an edgeedge with one Os(2)P6 octahedra. The corner-sharing octahedral tilt angles range from 54-56°. There are six inequivalent P sites. In the first P site, P(1) is bonded to one Os(1), one Os(2), one P(4), and one P(5) atom to form PP2Os2 tetrahedra that share corners with two equivalent Os(2)P6 octahedra,  a cornercorner with one P(1)P2Os2 tetrahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, corners with two equivalent P(5)P3Os tetrahedra, corners with three equivalent P(6)P3Os tetrahedra, and corners with four equivalent P(3)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 54-65°. In the second P site, P(2) is bonded to two equivalent Os(2), one P(2), and one P(6) atom to form PP2Os2 tetrahedra that share  a cornercorner with one Os(1)P6 octahedra, corners with two equivalent Os(2)P6 octahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, corners with three equivalent P(3)P2Os2 tetrahedra, corners with three equivalent P(5)P3Os tetrahedra, and  an edgeedge with one P(2)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 60-70°. In the third P site, P(3) is bonded to one Os(1), one Os(2), one P(4), and one P(6) atom to form PP2Os2 tetrahedra that share  a cornercorner with one Os(1)P6 octahedra,  a cornercorner with one Os(2)P6 octahedra,  a cornercorner with one P(3)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, corners with two equivalent P(5)P3Os tetrahedra, corners with two equivalent P(6)P3Os tetrahedra, corners with three equivalent P(2)P2Os2 tetrahedra, and corners with four equivalent P(1)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 65-71°. In the fourth P site, P(4) is bonded to one Os(2), one P(1), one P(3), and one P(4) atom to form PP3Os tetrahedra that share corners with two equivalent Os(1)P6 octahedra, corners with three equivalent Os(2)P6 octahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, and corners with two equivalent P(5)P3Os tetrahedra. The corner-sharing octahedral tilt angles range from 51-79°. In the fifth P site, P(5) is bonded to one Os(2), one P(1), one P(5), and one P(6) atom to form PP3Os tetrahedra that share corners with two equivalent Os(1)P6 octahedra, corners with two equivalent Os(2)P6 octahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, and corners with three equivalent P(2)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 44-78°. In the sixth P site, P(6) is bonded to one Os(1), one P(2), one P(3), and one P(5) atom to form PP3Os tetrahedra that share  a cornercorner with one Os(1)P6 octahedra, corners with four equivalent Os(2)P6 octahedra,  a cornercorner with one P(2)P2Os2 tetrahedra,  a cornercorner with one P(4)P3Os tetrahedra,  a cornercorner with one P(5)P3Os tetrahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, and corners with three equivalent P(1)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 60-80°.
OsP4 is Hausmannite-like structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to two equivalent P(1), two equivalent P(3), and two equivalent P(6) atoms to form OsP6 octahedra that share corners with four equivalent Os(2)P6 octahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, corners with two equivalent P(6)P3Os tetrahedra, corners with four equivalent P(4)P3Os tetrahedra, and corners with four equivalent P(5)P3Os tetrahedra. The corner-sharing octahedral tilt angles range from 54-56°. Both Os(1)-P(1) bond lengths are 2.39 Å. Both Os(1)-P(3) bond lengths are 2.38 Å. Both Os(1)-P(6) bond lengths are 2.36 Å. In the second Os site, Os(2) is bonded to one P(1), one P(3), one P(4), one P(5), and two equivalent P(2) atoms to form OsP6 octahedra that share corners with two equivalent Os(1)P6 octahedra,  a cornercorner with one P(3)P2Os2 tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(5)P3Os tetrahedra, corners with three equivalent P(4)P3Os tetrahedra, corners with four equivalent P(6)P3Os tetrahedra, and  an edgeedge with one Os(2)P6 octahedra. The corner-sharing octahedral tilt angles range from 54-56°. The Os(2)-P(1) bond length is 2.41 Å. The Os(2)-P(3) bond length is 2.42 Å. The Os(2)-P(4) bond length is 2.38 Å. The Os(2)-P(5) bond length is 2.33 Å. There is one shorter (2.33 Å) and one longer (2.39 Å) Os(2)-P(2) bond length. There are six inequivalent P sites. In the first P site, P(1) is bonded to one Os(1), one Os(2), one P(4), and one P(5) atom to form PP2Os2 tetrahedra that share corners with two equivalent Os(2)P6 octahedra,  a cornercorner with one P(1)P2Os2 tetrahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, corners with two equivalent P(5)P3Os tetrahedra, corners with three equivalent P(6)P3Os tetrahedra, and corners with four equivalent P(3)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 54-65°. The P(1)-P(4) bond length is 2.20 Å. The P(1)-P(5) bond length is 2.22 Å. In the second P site, P(2) is bonded to two equivalent Os(2), one P(2), and one P(6) atom to form PP2Os2 tetrahedra that share  a cornercorner with one Os(1)P6 octahedra, corners with two equivalent Os(2)P6 octahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, corners with three equivalent P(3)P2Os2 tetrahedra, corners with three equivalent P(5)P3Os tetrahedra, and  an edgeedge with one P(2)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 60-70°. The P(2)-P(2) bond length is 2.20 Å. The P(2)-P(6) bond length is 2.15 Å. In the third P site, P(3) is bonded to one Os(1), one Os(2), one P(4), and one P(6) atom to form PP2Os2 tetrahedra that share  a cornercorner with one Os(1)P6 octahedra,  a cornercorner with one Os(2)P6 octahedra,  a cornercorner with one P(3)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, corners with two equivalent P(5)P3Os tetrahedra, corners with two equivalent P(6)P3Os tetrahedra, corners with three equivalent P(2)P2Os2 tetrahedra, and corners with four equivalent P(1)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 65-71°. The P(3)-P(4) bond length is 2.17 Å. The P(3)-P(6) bond length is 2.24 Å. In the fourth P site, P(4) is bonded to one Os(2), one P(1), one P(3), and one P(4) atom to form PP3Os tetrahedra that share corners with two equivalent Os(1)P6 octahedra, corners with three equivalent Os(2)P6 octahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(2)P2Os2 tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, and corners with two equivalent P(5)P3Os tetrahedra. The corner-sharing octahedral tilt angles range from 51-79°. The P(4)-P(4) bond length is 2.32 Å. In the fifth P site, P(5) is bonded to one Os(2), one P(1), one P(5), and one P(6) atom to form PP3Os tetrahedra that share corners with two equivalent Os(1)P6 octahedra, corners with two equivalent Os(2)P6 octahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(1)P2Os2 tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, corners with two equivalent P(4)P3Os tetrahedra, and corners with three equivalent P(2)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 44-78°. The P(5)-P(5) bond length is 2.19 Å. The P(5)-P(6) bond length is 2.31 Å. In the sixth P site, P(6) is bonded to one Os(1), one P(2), one P(3), and one P(5) atom to form PP3Os tetrahedra that share  a cornercorner with one Os(1)P6 octahedra, corners with four equivalent Os(2)P6 octahedra,  a cornercorner with one P(2)P2Os2 tetrahedra,  a cornercorner with one P(4)P3Os tetrahedra,  a cornercorner with one P(5)P3Os tetrahedra,  a cornercorner with one P(6)P3Os tetrahedra, corners with two equivalent P(3)P2Os2 tetrahedra, and corners with three equivalent P(1)P2Os2 tetrahedra. The corner-sharing octahedral tilt angles range from 60-80°.