Pt3Sn2Sb4 is Marcasite-derived structured and crystallizes in the monoclinic Pm space group. There are six inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one Sn(3), one Sb(2), two equivalent Sb(5), and two equivalent Sb(8) atoms to form PtSnSb5 octahedra that share corners with two equivalent Pt(5)Sn2Sb4 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra, corners with four equivalent Pt(4)Sn2Sb4 octahedra,  a cornercorner with one Sn(1)SbPt3 tetrahedra,  a cornercorner with one Sb(1)SnPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, and edges with two equivalent Pt(1)SnSb5 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. In the second Pt site, Pt(2) is bonded to one Sn(1), one Sn(4), two equivalent Sb(3), and two equivalent Sb(6) atoms to form PtSn2Sb4 octahedra that share corners with two equivalent Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra, corners with four equivalent Pt(5)Sn2Sb4 octahedra,  a cornercorner with one Sn(2)SnPt3 tetrahedra,  a cornercorner with one Sb(2)SnPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, and edges with two equivalent Pt(2)Sn2Sb4 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the third Pt site, Pt(3) is bonded to one Sn(2), one Sb(1), two equivalent Sb(4), and two equivalent Sb(7) atoms to form PtSnSb5 octahedra that share corners with two equivalent Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(5)Sn2Sb4 octahedra, corners with four equivalent Pt(6)Sn4Sb2 octahedra,  a cornercorner with one Sn(3)SbPt3 tetrahedra,  a cornercorner with one Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, and edges with two equivalent Pt(3)SnSb5 octahedra. The corner-sharing octahedral tilt angles range from 56-58°. In the fourth Pt site, Pt(4) is bonded to two equivalent Sn(1), one Sb(5), one Sb(8), and two equivalent Sb(1) atoms to form PtSn2Sb4 octahedra that share corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with four equivalent Pt(1)SnSb5 octahedra,  a cornercorner with one Sb(4)SbPt3 tetrahedra,  a cornercorner with one Sb(6)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, and edges with two equivalent Pt(4)Sn2Sb4 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. In the fifth Pt site, Pt(5) is bonded to two equivalent Sn(2), one Sb(3), one Sb(6), and two equivalent Sb(2) atoms to form PtSn2Sb4 octahedra that share corners with two equivalent Pt(1)SnSb5 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with four equivalent Pt(2)Sn2Sb4 octahedra,  a cornercorner with one Sb(5)SbPt3 tetrahedra,  a cornercorner with one Sb(7)SbPt3 tetrahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, and edges with two equivalent Pt(5)Sn2Sb4 octahedra. The corner-sharing octahedral tilt angles range from 56-58°. In the sixth Pt site, Pt(6) is bonded to two equivalent Sn(3), two equivalent Sn(4), one Sb(4), and one Sb(7) atom to form PtSn4Sb2 octahedra that share corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(1)SnSb5 octahedra, corners with four equivalent Pt(3)SnSb5 octahedra,  a cornercorner with one Sb(3)SbPt3 tetrahedra,  a cornercorner with one Sb(8)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, and edges with two equivalent Pt(6)Sn4Sb2 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Pt(2), two equivalent Pt(4), and one Sb(2) atom to form SnSbPt3 tetrahedra that share  a cornercorner with one Pt(1)SnSb5 octahedra, corners with two equivalent Pt(5)Sn2Sb4 octahedra,  a cornercorner with one Sn(4)SnPt3 tetrahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, and  an edgeedge with one Sb(1)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-78°. In the second Sn site, Sn(2) is bonded to one Pt(3), two equivalent Pt(5), and one Sn(4) atom to form distorted SnSnPt3 tetrahedra that share  a cornercorner with one Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra,  a cornercorner with one Sb(1)SnPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, and  an edgeedge with one Sb(2)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-78°. In the third Sn site, Sn(3) is bonded to one Pt(1), two equivalent Pt(6), and one Sb(1) atom to form SnSbPt3 tetrahedra that share  a cornercorner with one Pt(3)SnSb5 octahedra, corners with two equivalent Pt(4)Sn2Sb4 octahedra,  a cornercorner with one Sb(2)SnPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, and  an edgeedge with one Sn(4)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-77°. In the fourth Sn site, Sn(4) is bonded to one Pt(2), two equivalent Pt(6), and one Sn(2) atom to form distorted SnSnPt3 tetrahedra that share  a cornercorner with one Pt(3)SnSb5 octahedra, corners with two equivalent Pt(5)Sn2Sb4 octahedra,  a cornercorner with one Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, and  an edgeedge with one Sn(3)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-78°. There are eight inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one Pt(3), two equivalent Pt(4), and one Sn(3) atom to form SbSnPt3 tetrahedra that share  a cornercorner with one Pt(1)SnSb5 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra,  a cornercorner with one Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, and  an edgeedge with one Sn(1)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-77°. In the second Sb site, Sb(2) is bonded to one Pt(1), two equivalent Pt(5), and one Sn(1) atom to form SbSnPt3 tetrahedra that share  a cornercorner with one Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(4)Sn2Sb4 octahedra,  a cornercorner with one Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, and  an edgeedge with one Sn(2)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-78°. In the third Sb site, Sb(3) is bonded to one Pt(5), two equivalent Pt(2), and one Sb(7) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(6)Sn4Sb2 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(6)SbPt3 tetrahedra, and  an edgeedge with one Sb(6)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 73-76°. In the fourth Sb site, Sb(4) is bonded to one Pt(6), two equivalent Pt(3), and one Sb(8) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(1)SnSb5 octahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with three equivalent Sb(7)SbPt3 tetrahedra, and  an edgeedge with one Sb(7)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 73-77°. In the fifth Sb site, Sb(5) is bonded to one Pt(4), two equivalent Pt(1), and one Sb(6) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(5)Sn2Sb4 octahedra, corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(8)SbPt3 tetrahedra, and  an edgeedge with one Sb(8)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-78°. In the sixth Sb site, Sb(6) is bonded to one Pt(5), two equivalent Pt(2), and one Sb(5) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(1)SnSb5 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(3)SbPt3 tetrahedra, and  an edgeedge with one Sb(3)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-76°. In the seventh Sb site, Sb(7) is bonded to one Pt(6), two equivalent Pt(3), and one Sb(3) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(5)Sn2Sb4 octahedra, corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with three equivalent Sb(4)SbPt3 tetrahedra, and  an edgeedge with one Sb(4)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-76°. In the eighth Sb site, Sb(8) is bonded to one Pt(4), two equivalent Pt(1), and one Sb(4) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(6)Sn4Sb2 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(5)SbPt3 tetrahedra, and  an edgeedge with one Sb(5)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-77°.
Pt3Sn2Sb4 is Marcasite-derived structured and crystallizes in the monoclinic Pm space group. There are six inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one Sn(3), one Sb(2), two equivalent Sb(5), and two equivalent Sb(8) atoms to form PtSnSb5 octahedra that share corners with two equivalent Pt(5)Sn2Sb4 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra, corners with four equivalent Pt(4)Sn2Sb4 octahedra,  a cornercorner with one Sn(1)SbPt3 tetrahedra,  a cornercorner with one Sb(1)SnPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, and edges with two equivalent Pt(1)SnSb5 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. The Pt(1)-Sn(3) bond length is 2.69 Å. The Pt(1)-Sb(2) bond length is 2.68 Å. Both Pt(1)-Sb(5) bond lengths are 2.69 Å. Both Pt(1)-Sb(8) bond lengths are 2.70 Å. In the second Pt site, Pt(2) is bonded to one Sn(1), one Sn(4), two equivalent Sb(3), and two equivalent Sb(6) atoms to form PtSn2Sb4 octahedra that share corners with two equivalent Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra, corners with four equivalent Pt(5)Sn2Sb4 octahedra,  a cornercorner with one Sn(2)SnPt3 tetrahedra,  a cornercorner with one Sb(2)SnPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, and edges with two equivalent Pt(2)Sn2Sb4 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. The Pt(2)-Sn(1) bond length is 2.70 Å. The Pt(2)-Sn(4) bond length is 2.71 Å. Both Pt(2)-Sb(3) bond lengths are 2.69 Å. Both Pt(2)-Sb(6) bond lengths are 2.69 Å. In the third Pt site, Pt(3) is bonded to one Sn(2), one Sb(1), two equivalent Sb(4), and two equivalent Sb(7) atoms to form PtSnSb5 octahedra that share corners with two equivalent Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(5)Sn2Sb4 octahedra, corners with four equivalent Pt(6)Sn4Sb2 octahedra,  a cornercorner with one Sn(3)SbPt3 tetrahedra,  a cornercorner with one Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, and edges with two equivalent Pt(3)SnSb5 octahedra. The corner-sharing octahedral tilt angles range from 56-58°. The Pt(3)-Sn(2) bond length is 2.71 Å. The Pt(3)-Sb(1) bond length is 2.68 Å. Both Pt(3)-Sb(4) bond lengths are 2.70 Å. Both Pt(3)-Sb(7) bond lengths are 2.70 Å. In the fourth Pt site, Pt(4) is bonded to two equivalent Sn(1), one Sb(5), one Sb(8), and two equivalent Sb(1) atoms to form PtSn2Sb4 octahedra that share corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with four equivalent Pt(1)SnSb5 octahedra,  a cornercorner with one Sb(4)SbPt3 tetrahedra,  a cornercorner with one Sb(6)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, and edges with two equivalent Pt(4)Sn2Sb4 octahedra. The corner-sharing octahedral tilt angles range from 55-57°. Both Pt(4)-Sn(1) bond lengths are 2.73 Å. The Pt(4)-Sb(5) bond length is 2.68 Å. The Pt(4)-Sb(8) bond length is 2.67 Å. Both Pt(4)-Sb(1) bond lengths are 2.71 Å. In the fifth Pt site, Pt(5) is bonded to two equivalent Sn(2), one Sb(3), one Sb(6), and two equivalent Sb(2) atoms to form PtSn2Sb4 octahedra that share corners with two equivalent Pt(1)SnSb5 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with four equivalent Pt(2)Sn2Sb4 octahedra,  a cornercorner with one Sb(5)SbPt3 tetrahedra,  a cornercorner with one Sb(7)SbPt3 tetrahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, and edges with two equivalent Pt(5)Sn2Sb4 octahedra. The corner-sharing octahedral tilt angles range from 56-58°. Both Pt(5)-Sn(2) bond lengths are 2.74 Å. The Pt(5)-Sb(3) bond length is 2.67 Å. The Pt(5)-Sb(6) bond length is 2.68 Å. Both Pt(5)-Sb(2) bond lengths are 2.70 Å. In the sixth Pt site, Pt(6) is bonded to two equivalent Sn(3), two equivalent Sn(4), one Sb(4), and one Sb(7) atom to form PtSn4Sb2 octahedra that share corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(1)SnSb5 octahedra, corners with four equivalent Pt(3)SnSb5 octahedra,  a cornercorner with one Sb(3)SbPt3 tetrahedra,  a cornercorner with one Sb(8)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, and edges with two equivalent Pt(6)Sn4Sb2 octahedra. The corner-sharing octahedral tilt angles range from 55-58°. Both Pt(6)-Sn(3) bond lengths are 2.73 Å. Both Pt(6)-Sn(4) bond lengths are 2.73 Å. The Pt(6)-Sb(4) bond length is 2.66 Å. The Pt(6)-Sb(7) bond length is 2.66 Å. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Pt(2), two equivalent Pt(4), and one Sb(2) atom to form SnSbPt3 tetrahedra that share  a cornercorner with one Pt(1)SnSb5 octahedra, corners with two equivalent Pt(5)Sn2Sb4 octahedra,  a cornercorner with one Sn(4)SnPt3 tetrahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, and  an edgeedge with one Sb(1)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-78°. The Sn(1)-Sb(2) bond length is 2.89 Å. In the second Sn site, Sn(2) is bonded to one Pt(3), two equivalent Pt(5), and one Sn(4) atom to form distorted SnSnPt3 tetrahedra that share  a cornercorner with one Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra,  a cornercorner with one Sb(1)SnPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, and  an edgeedge with one Sb(2)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-78°. The Sn(2)-Sn(4) bond length is 2.88 Å. In the third Sn site, Sn(3) is bonded to one Pt(1), two equivalent Pt(6), and one Sb(1) atom to form SnSbPt3 tetrahedra that share  a cornercorner with one Pt(3)SnSb5 octahedra, corners with two equivalent Pt(4)Sn2Sb4 octahedra,  a cornercorner with one Sb(2)SnPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, and  an edgeedge with one Sn(4)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-77°. The Sn(3)-Sb(1) bond length is 2.87 Å. In the fourth Sn site, Sn(4) is bonded to one Pt(2), two equivalent Pt(6), and one Sn(2) atom to form distorted SnSnPt3 tetrahedra that share  a cornercorner with one Pt(3)SnSb5 octahedra, corners with two equivalent Pt(5)Sn2Sb4 octahedra,  a cornercorner with one Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, and  an edgeedge with one Sn(3)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-78°. There are eight inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one Pt(3), two equivalent Pt(4), and one Sn(3) atom to form SbSnPt3 tetrahedra that share  a cornercorner with one Pt(1)SnSb5 octahedra, corners with two equivalent Pt(6)Sn4Sb2 octahedra,  a cornercorner with one Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, and  an edgeedge with one Sn(1)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-77°. In the second Sb site, Sb(2) is bonded to one Pt(1), two equivalent Pt(5), and one Sn(1) atom to form SbSnPt3 tetrahedra that share  a cornercorner with one Pt(2)Sn2Sb4 octahedra, corners with two equivalent Pt(4)Sn2Sb4 octahedra,  a cornercorner with one Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, and  an edgeedge with one Sn(2)SnPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 75-78°. In the third Sb site, Sb(3) is bonded to one Pt(5), two equivalent Pt(2), and one Sb(7) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(6)Sn4Sb2 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(3)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(6)SbPt3 tetrahedra, and  an edgeedge with one Sb(6)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 73-76°. The Sb(3)-Sb(7) bond length is 2.89 Å. In the fourth Sb site, Sb(4) is bonded to one Pt(6), two equivalent Pt(3), and one Sb(8) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(1)SnSb5 octahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(4)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with three equivalent Sb(7)SbPt3 tetrahedra, and  an edgeedge with one Sb(7)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 73-77°. The Sb(4)-Sb(8) bond length is 2.92 Å. In the fifth Sb site, Sb(5) is bonded to one Pt(4), two equivalent Pt(1), and one Sb(6) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(5)Sn2Sb4 octahedra, corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sb(5)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(8)SbPt3 tetrahedra, and  an edgeedge with one Sb(8)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-78°. The Sb(5)-Sb(6) bond length is 2.91 Å. In the sixth Sb site, Sb(6) is bonded to one Pt(5), two equivalent Pt(2), and one Sb(5) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(4)Sn2Sb4 octahedra, corners with two equivalent Pt(1)SnSb5 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(6)SbPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(3)SbPt3 tetrahedra, and  an edgeedge with one Sb(3)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-76°. In the seventh Sb site, Sb(7) is bonded to one Pt(6), two equivalent Pt(3), and one Sb(3) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(5)Sn2Sb4 octahedra, corners with two equivalent Pt(2)Sn2Sb4 octahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sn(2)SnPt3 tetrahedra, corners with two equivalent Sn(4)SnPt3 tetrahedra, corners with two equivalent Sb(7)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with three equivalent Sb(4)SbPt3 tetrahedra, and  an edgeedge with one Sb(4)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-76°. In the eighth Sb site, Sb(8) is bonded to one Pt(4), two equivalent Pt(1), and one Sb(4) atom to form distorted SbSbPt3 tetrahedra that share  a cornercorner with one Pt(6)Sn4Sb2 octahedra, corners with two equivalent Pt(3)SnSb5 octahedra, corners with two equivalent Sn(1)SbPt3 tetrahedra, corners with two equivalent Sn(3)SbPt3 tetrahedra, corners with two equivalent Sb(8)SbPt3 tetrahedra, corners with two equivalent Sb(1)SnPt3 tetrahedra, corners with two equivalent Sb(2)SnPt3 tetrahedra, corners with three equivalent Sb(5)SbPt3 tetrahedra, and  an edgeedge with one Sb(5)SbPt3 tetrahedra. The corner-sharing octahedral tilt angles range from 74-77°.