Materials Data on HfSiSe by Materials Project
HfSiSe crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Hf is bonded in a 4-coordinate geometry to four equivalent Si and five equivalent Se atoms. All Hf–Si bond lengths are 2.78 Å. There are four shorter (2.75 Å) and one longer (3.27 Å) Hf–Se bond lengths. Si is bonded in a 8-coordinate geometry to four equivalent Hf and four equivalent Si atoms. All Si–Si bond lengths are 2.54 Å. Se is bonded in a 4-coordinate geometry to five equivalent Hf atoms.
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