K2RuO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(2), three equivalent O(3), and four equivalent O(1) atoms. Ru(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent K(1), two equivalent K(2), and one Ru(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Ru(1) atom. In the third O site, O(3) is bonded to two equivalent K(1), three equivalent K(2), and one Ru(1) atom to form a mixture of distorted corner and edge-sharing OK5Ru octahedra. The corner-sharing octahedral tilt angles range from 5-29°.
K2RuO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(1) atoms. The K(1)-O(2) bond length is 2.77 Å. There is one shorter (2.80 Å) and one longer (3.03 Å) K(1)-O(3) bond length. There are two shorter (2.68 Å) and two longer (2.75 Å) K(1)-O(1) bond lengths. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(2), three equivalent O(3), and four equivalent O(1) atoms. The K(2)-O(2) bond length is 2.57 Å. There is one shorter (2.88 Å) and two longer (3.08 Å) K(2)-O(3) bond lengths. There are two shorter (3.09 Å) and two longer (3.16 Å) K(2)-O(1) bond lengths. Ru(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Ru(1)-O(2) bond length is 1.76 Å. The Ru(1)-O(3) bond length is 1.79 Å. Both Ru(1)-O(1) bond lengths are 1.78 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent K(1), two equivalent K(2), and one Ru(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Ru(1) atom. In the third O site, O(3) is bonded to two equivalent K(1), three equivalent K(2), and one Ru(1) atom to form a mixture of distorted corner and edge-sharing OK5Ru octahedra. The corner-sharing octahedral tilt angles range from 5-29°.