Cu3NbSe4 is Sulvanite structured and crystallizes in the cubic P-43m space group. Nb(1) is bonded to four equivalent Se(1) atoms to form distorted NbSe4 tetrahedra that share edges with six equivalent Cu(1)Se4 tetrahedra. Cu(1) is bonded to four equivalent Se(1) atoms to form distorted CuSe4 tetrahedra that share corners with eight equivalent Cu(1)Se4 tetrahedra and edges with two equivalent Nb(1)Se4 tetrahedra. Se(1) is bonded to one Nb(1) and three equivalent Cu(1) atoms to form a mixture of edge and corner-sharing SeNbCu3 tetrahedra.
Cu3NbSe4 is Sulvanite structured and crystallizes in the cubic P-43m space group. Nb(1) is bonded to four equivalent Se(1) atoms to form distorted NbSe4 tetrahedra that share edges with six equivalent Cu(1)Se4 tetrahedra. All Nb(1)-Se(1) bond lengths are 2.45 Å. Cu(1) is bonded to four equivalent Se(1) atoms to form distorted CuSe4 tetrahedra that share corners with eight equivalent Cu(1)Se4 tetrahedra and edges with two equivalent Nb(1)Se4 tetrahedra. All Cu(1)-Se(1) bond lengths are 2.45 Å. Se(1) is bonded to one Nb(1) and three equivalent Cu(1) atoms to form a mixture of edge and corner-sharing SeNbCu3 tetrahedra.