KMgNbO3 crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), three equivalent O(2), and four equivalent O(1) atoms. Mg(1) is bonded in a 2-coordinate geometry to two equivalent K(1) and four equivalent O(1) atoms. Nb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 4°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded to three equivalent K(1) and two equivalent Nb(1) atoms to form distorted corner-sharing OK3Nb2 trigonal bipyramids.
KMgNbO3 crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), three equivalent O(2), and four equivalent O(1) atoms. Both K(1)-Mg(1) bond lengths are 2.68 Å. There is one shorter (2.43 Å) and two longer (2.97 Å) K(1)-O(2) bond lengths. All K(1)-O(1) bond lengths are 2.61 Å. Mg(1) is bonded in a 2-coordinate geometry to two equivalent K(1) and four equivalent O(1) atoms. There are two shorter (1.94 Å) and two longer (2.54 Å) Mg(1)-O(1) bond lengths. Nb(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 4°. Both Nb(1)-O(2) bond lengths are 2.16 Å. There are two shorter (2.20 Å) and two longer (2.24 Å) Nb(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded to three equivalent K(1) and two equivalent Nb(1) atoms to form distorted corner-sharing OK3Nb2 trigonal bipyramids.