KY3F10 crystallizes in the trigonal R3m space group. K(1) is bonded in a 7-coordinate geometry to one F(2) and six equivalent F(1) atoms. Y(1) is bonded to one F(2), two equivalent F(3), and four equivalent F(1) atoms to form distorted corner-sharing YF7 pentagonal bipyramids. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one K(1) and two equivalent Y(1) atoms. In the second F site, F(2) is bonded in a trigonal pyramidal geometry to one K(1) and three equivalent Y(1) atoms. In the third F site, F(3) is bonded in a linear geometry to two equivalent Y(1) atoms.
KY3F10 crystallizes in the trigonal R3m space group. K(1) is bonded in a 7-coordinate geometry to one F(2) and six equivalent F(1) atoms. The K(1)-F(2) bond length is 2.75 Å. All K(1)-F(1) bond lengths are 3.00 Å. Y(1) is bonded to one F(2), two equivalent F(3), and four equivalent F(1) atoms to form distorted corner-sharing YF7 pentagonal bipyramids. The Y(1)-F(2) bond length is 2.67 Å. Both Y(1)-F(3) bond lengths are 2.17 Å. There are two shorter (2.24 Å) and two longer (2.26 Å) Y(1)-F(1) bond lengths. There are three inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one K(1) and two equivalent Y(1) atoms. In the second F site, F(2) is bonded in a trigonal pyramidal geometry to one K(1) and three equivalent Y(1) atoms. In the third F site, F(3) is bonded in a linear geometry to two equivalent Y(1) atoms.