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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ni3P by Materials Project

Ni3P crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. there are three inequivalent Ni1+ sites. In the first Ni1+ site, Ni1+ is bonded in a water-like geometry to two equivalent P3- atoms. There are one shorter (2.21 Å) and one longer (2.26 Å) Ni–P bond lengths. In the second Ni1+ site, Ni1+ is bonded in a distorted trigonal non-coplanar geometry to three equivalent P3- atoms. There are a spread of Ni–P bond distances ranging from 2.21–2.35 Å. In the third Ni1+ site, Ni1+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. There are a spread of Ni–P bond distances ranging from 2.29–2.33 Å. P3- is bonded in a 9-coordinate geometry to nine Ni1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Structure and Behavior of the Ni End-Member Schreibersite Ni 3 P under Compression to 50 GPa

To better understand the potential presence of light element alloys of Fe and Ni in the Earth’s interior, the crystal structure and compressional behavior of the Ni-P binary compound, schreibersite (Ni 3 P), have been investigated using synchrotron X-ray diffraction experiments. Both powder and two single-crystal samples of synthetic Ni 3 P (in different orientations with respect to the loading axis of the diamond anvil cell) were compressed up to approximately 50 GPa at ambient temperature. The compressional data obtained for Ni3P were fitted with a 3rd order Birch–Murnaghan equation of state. All data indicated that the c/a ratio of unit cell parameters remained approximately constant up to about 30 GPa but then increased progressively with pressure, exhibiting a second slight discontinuity at approximately 40 GPa. The changes in unit cell parameters at ~30 GPa and ~40 GPa suggested discontinuous changes in magnetic ordering. Moreover, the threshold of these subtle discontinuities is sensitive to the stress state and orientation of the crystal in the diamond anvil cell. This study is the first report on the compressional behavior of both powder and single-crystal schreibersite at high-pressure (up to 50 GPa). It offers insights into the effects of Ni 3 P components on the compressional behavior of the Earth’s core.

36 MATERIALS SCIENCE↗