Materials Data on SmF3 by Materials Project
SmF3 crystallizes in the hexagonal P6_322 space group. The structure is three-dimensional. Sm3+ is bonded in a 4-coordinate geometry to twelve F1- atoms. There are a spread of Sm–F bond distances ranging from 2.33–2.92 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a trigonal planar geometry to three equivalent Sm3+ atoms. In the second F1- site, F1- is bonded in a 1-coordinate geometry to four equivalent Sm3+ and one F1- atom. The F–F bond length is 2.49 Å. In the third F1- site, F1- is bonded to six equivalent Sm3+ and six equivalent F1- atoms to form face-sharing FSm6F6 cuboctahedra.
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