Materials Data on LiTmF2 by Materials Project
LiTmF2 crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Li is bonded in a square co-planar geometry to four equivalent F atoms. All Li–F bond lengths are 2.45 Å. Tm is bonded to six equivalent F atoms to form distorted edge-sharing TmF6 octahedra. There are two shorter (2.32 Å) and four longer (2.35 Å) Tm–F bond lengths. F is bonded to two equivalent Li and three equivalent Tm atoms to form a mixture of distorted edge and corner-sharing FLi2Tm3 trigonal bipyramids.
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