ThO2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Th(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to five equivalent Th(1) atoms. In the second O site, O(1) is bonded to four equivalent Th(1) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra.
ThO2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. Th(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. There are a spread of Th(1)-O(1) bond distances ranging from 2.37-2.42 Å. There are a spread of Th(1)-O(2) bond distances ranging from 2.32-2.95 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to five equivalent Th(1) atoms. In the second O site, O(1) is bonded to four equivalent Th(1) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra.