MgNb2O5 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Nb(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of distorted edge and corner-sharing NbO6 pentagonal pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and two equivalent Nb(1) atoms to form a mixture of distorted edge and corner-sharing OMg2Nb2 trigonal pyramids. In the second O site, O(2) is bonded in a linear geometry to four equivalent Mg(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to three equivalent Nb(1) atoms.
MgNb2O5 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Mg(1)-O(1) bond lengths are 2.48 Å. All Mg(1)-O(2) bond lengths are 2.74 Å. Nb(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of distorted edge and corner-sharing NbO6 pentagonal pyramids. The Nb(1)-O(2) bond length is 2.01 Å. There is one shorter (2.04 Å) and one longer (2.06 Å) Nb(1)-O(1) bond length. There are two shorter (1.99 Å) and one longer (2.24 Å) Nb(1)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and two equivalent Nb(1) atoms to form a mixture of distorted edge and corner-sharing OMg2Nb2 trigonal pyramids. In the second O site, O(2) is bonded in a linear geometry to four equivalent Mg(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to three equivalent Nb(1) atoms.