SrO2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted SrO8 hexagonal bipyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with four equivalent O(1)Sr4O square pyramids, edges with six equivalent Sr(1)O8 hexagonal bipyramids, and faces with two equivalent Sr(1)O8 hexagonal bipyramids. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one O(1) atom. In the second O site, O(1) is bonded to four equivalent Sr(1) and one O(2) atom to form distorted OSr4O square pyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with eight equivalent O(1)Sr4O square pyramids, and edges with two equivalent O(1)Sr4O square pyramids.
SrO2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted SrO8 hexagonal bipyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with four equivalent O(1)Sr4O square pyramids, edges with six equivalent Sr(1)O8 hexagonal bipyramids, and faces with two equivalent Sr(1)O8 hexagonal bipyramids. There are a spread of Sr(1)-O(1) bond distances ranging from 2.45-2.56 Å. There are a spread of Sr(1)-O(2) bond distances ranging from 2.62-2.81 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one O(1) atom. The O(2)-O(1) bond length is 1.51 Å. In the second O site, O(1) is bonded to four equivalent Sr(1) and one O(2) atom to form distorted OSr4O square pyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with eight equivalent O(1)Sr4O square pyramids, and edges with two equivalent O(1)Sr4O square pyramids.