K3NaMg(RuO4)2 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. In the second K site, K(2) is bonded in a linear geometry to two equivalent O(2) atoms. Na(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted NaO6 octahedra that share corners with six equivalent Ru(1)O4 tetrahedra. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. Ru(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form RuO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-21°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one Na(1), one Mg(1), and one Ru(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(2), three equivalent K(1), one Na(1), and one Ru(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one K(1) and one Ru(1) atom.
K3NaMg(RuO4)2 is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. The K(1)-O(3) bond length is 2.61 Å. Both K(1)-O(1) bond lengths are 2.68 Å. There is one shorter (3.01 Å) and two longer (3.17 Å) K(1)-O(2) bond lengths. In the second K site, K(2) is bonded in a linear geometry to two equivalent O(2) atoms. Both K(2)-O(2) bond lengths are 2.91 Å. Na(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form distorted NaO6 octahedra that share corners with six equivalent Ru(1)O4 tetrahedra. Both Na(1)-O(2) bond lengths are 2.93 Å. All Na(1)-O(1) bond lengths are 2.34 Å. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 1.99 Å. Ru(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form RuO4 tetrahedra that share corners with three equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-21°. The Ru(1)-O(2) bond length is 1.80 Å. The Ru(1)-O(3) bond length is 1.76 Å. Both Ru(1)-O(1) bond lengths are 1.93 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one Na(1), one Mg(1), and one Ru(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(2), three equivalent K(1), one Na(1), and one Ru(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one K(1) and one Ru(1) atom.