Materials Data on K2W2O15 by Materials Project
K2W2O15 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of K–O bond distances ranging from 2.65–3.13 Å. In the second K site, K is bonded in a 6-coordinate geometry to six O atoms. There are a spread of K–O bond distances ranging from 2.68–3.08 Å. There are two inequivalent W sites. In the first W site, W is bonded to five O atoms to form distorted corner-sharing WO5 trigonal bipyramids. There are a spread of W–O bond distances ranging from 1.77–2.12 Å. In the second W site, W is bonded to seven O atoms to form distorted WO7 pentagonal bipyramids that share a cornercorner with one OK2WO tetrahedra and a cornercorner with one WO5 trigonal bipyramid. There are a spread of W–O bond distances ranging from 1.81–2.22 Å. There are fifteen inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one K and one W atom. In the second O site, O is bonded in a bent 120 degrees geometry to one K and one O atom. The O–O bond length is 1.23 Å. In the third O site, O is bonded in a bent 150 degrees geometry to one K and one O atom. In the fourth O site, O is bonded in a distorted water-like geometry to one W and one O atom. The O–O bond length is 1.34 Å. In the fifth O site, O is bonded in a 3-coordinate geometry to two equivalent K and one O atom. In the sixth O site, O is bonded in a distorted bent 150 degrees geometry to one K and one O atom. The O–O bond length is 1.33 Å. In the seventh O site, O is bonded in a trigonal planar geometry to one K, one W, and one O atom. In the eighth O site, O is bonded in a 2-coordinate geometry to one W and one O atom. The O–O bond length is 1.36 Å. In the ninth O site, O is bonded in a distorted T-shaped geometry to one K, one W, and one O atom. In the tenth O site, O is bonded to two K, one W, and one O atom to form distorted OK2WO tetrahedra that share a cornercorner with one WO7 pentagonal bipyramid. The O–O bond length is 1.35 Å. In the eleventh O site, O is bonded in a 2-coordinate geometry to one W and one O atom. In the twelfth O site, O is bonded in a distorted single-bond geometry to two K and one W atom. In the thirteenth O site, O is bonded in a bent 150 degrees geometry to one K and one W atom. In the fourteenth O site, O is bonded in a bent 150 degrees geometry to two W atoms. In the fifteenth O site, O is bonded in a distorted single-bond geometry to one K and one W atom.