Tm2O3 is Corundum-like structured and crystallizes in the cubic Ia-3 space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to six equivalent O(1) atoms to form a mixture of corner and edge-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles are 56°. In the second Tm site, Tm(2) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 54-56°. O(1) is bonded to one Tm(1) and three equivalent Tm(2) atoms to form a mixture of corner and edge-sharing OTm4 trigonal pyramids.
Tm2O3 is Corundum-like structured and crystallizes in the cubic Ia-3 space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to six equivalent O(1) atoms to form a mixture of corner and edge-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles are 56°. All Tm(1)-O(1) bond lengths are 2.24 Å. In the second Tm site, Tm(2) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 54-56°. There are a spread of Tm(2)-O(1) bond distances ranging from 2.20-2.29 Å. O(1) is bonded to one Tm(1) and three equivalent Tm(2) atoms to form a mixture of corner and edge-sharing OTm4 trigonal pyramids.