TmNbO4 crystallizes in the monoclinic C2/c space group. Tm(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Nb(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one Nb(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Tm(1) and two equivalent Nb(1) atoms.
TmNbO4 crystallizes in the monoclinic C2/c space group. Tm(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two shorter (2.27 Å) and two longer (2.33 Å) Tm(1)-O(1) bond lengths. There are two shorter (2.29 Å) and two longer (2.38 Å) Tm(1)-O(2) bond lengths. Nb(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Nb(1)-O(1) bond lengths are 1.88 Å. There are two shorter (1.94 Å) and two longer (2.45 Å) Nb(1)-O(2) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Tm(1) and one Nb(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Tm(1) and two equivalent Nb(1) atoms.