Materials Data on K7LiSi8 by Materials Project
KK6LiSi8 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional and consists of four potassium molecules and one K6LiSi8 framework. In the K6LiSi8 framework, K1+ is bonded in a 6-coordinate geometry to six Si1- atoms. There are a spread of K–Si bond distances ranging from 3.41–3.52 Å. Li1+ is bonded in a distorted hexagonal planar geometry to six equivalent Si1- atoms. All Li–Si bond lengths are 2.71 Å. There are two inequivalent Si1- sites. In the first Si1- site, Si1- is bonded in a 1-coordinate geometry to four equivalent K1+, one Li1+, and three Si1- atoms. There are one shorter (2.41 Å) and two longer (2.46 Å) Si–Si bond lengths. In the second Si1- site, Si1- is bonded in a 9-coordinate geometry to six equivalent K1+ and three equivalent Si1- atoms.