Materials Data on K2LuF5 by Materials Project
K2LuF5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.66–2.89 Å. Lu3+ is bonded to seven F1- atoms to form distorted edge-sharing LuF7 pentagonal bipyramids. There are a spread of Lu–F bond distances ranging from 2.15–2.26 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a 5-coordinate geometry to four equivalent K1+ and one Lu3+ atom. In the second F1- site, F1- is bonded in a 1-coordinate geometry to four equivalent K1+ and one Lu3+ atom. In the third F1- site, F1- is bonded in a 5-coordinate geometry to four equivalent K1+ and one Lu3+ atom. In the fourth F1- site, F1- is bonded in a 4-coordinate geometry to two equivalent K1+ and two equivalent Lu3+ atoms.