KNdHf4O12 crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a distorted q6 geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(5) atoms. Nd(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. Hf(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing HfO6 octahedra. The corner-sharing octahedral tilt angles range from 6-32°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one K(1), one Nd(1), and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to one K(1), one Nd(1), and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Nd(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Hf(1) atoms. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to two equivalent K(1) and two equivalent Hf(1) atoms.
KNdHf4O12 crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a distorted q6 geometry to two equivalent O(2), four equivalent O(1), and four equivalent O(5) atoms. Both K(1)-O(2) bond lengths are 2.98 Å. All K(1)-O(1) bond lengths are 2.97 Å. There are two shorter (2.86 Å) and two longer (2.93 Å) K(1)-O(5) bond lengths. Nd(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. Both Nd(1)-O(2) bond lengths are 2.64 Å. Both Nd(1)-O(3) bond lengths are 2.52 Å. Both Nd(1)-O(4) bond lengths are 2.44 Å. All Nd(1)-O(1) bond lengths are 2.84 Å. Hf(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form corner-sharing HfO6 octahedra. The corner-sharing octahedral tilt angles range from 6-32°. The Hf(1)-O(2) bond length is 2.10 Å. The Hf(1)-O(3) bond length is 2.05 Å. The Hf(1)-O(4) bond length is 2.14 Å. The Hf(1)-O(5) bond length is 2.03 Å. Both Hf(1)-O(1) bond lengths are 2.07 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one K(1), one Nd(1), and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to one K(1), one Nd(1), and two equivalent Hf(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Nd(1) and two equivalent Hf(1) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Hf(1) atoms. In the fifth O site, O(5) is bonded in a distorted square co-planar geometry to two equivalent K(1) and two equivalent Hf(1) atoms.