Materials Data on HfP2 by Materials Project
HfP2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Hf4+ is bonded in a 9-coordinate geometry to nine P2- atoms. There are a spread of Hf–P bond distances ranging from 2.68–2.79 Å. There are two inequivalent P2- sites. In the first P2- site, P2- is bonded in a 7-coordinate geometry to five equivalent Hf4+ and two equivalent P2- atoms. Both P–P bond lengths are 2.75 Å. In the second P2- site, P2- is bonded in a 8-coordinate geometry to four equivalent Hf4+ and four P2- atoms. Both P–P bond lengths are 2.36 Å.
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