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Article

Structure and Behavior of the Ni End-Member Schreibersite Ni3P under Compression to 50 GPa

1
Department of Earth Sciences, University of Hawai’i at Mānoa, Honolulu, HI 96822, USA
2
Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Mānoa, Honolulu, HI 96822, USA
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(4), 306; https://doi.org/10.3390/min10040306
Received: 15 February 2020 / Revised: 19 March 2020 / Accepted: 27 March 2020 / Published: 30 March 2020
(This article belongs to the Special Issue Mineral Physics—In Memory of Orson Anderson)
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 (Ni3P), have been investigated using synchrotron X-ray diffraction experiments. Both powder and two single-crystal samples of synthetic Ni3P (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 Ni3P components on the compressional behavior of the Earth’s core. View Full-Text
Keywords: schreibersite; high pressure; diamond anvil cell; synchrotron x-ray diffraction; single-crystal x-ray diffraction schreibersite; high pressure; diamond anvil cell; synchrotron x-ray diffraction; single-crystal x-ray diffraction
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MDPI and ACS Style

Chornkrathok, S.; Zhang, D.; Dera, P. Structure and Behavior of the Ni End-Member Schreibersite Ni3P under Compression to 50 GPa. Minerals 2020, 10, 306. https://doi.org/10.3390/min10040306

AMA Style

Chornkrathok S, Zhang D, Dera P. Structure and Behavior of the Ni End-Member Schreibersite Ni3P under Compression to 50 GPa. Minerals. 2020; 10(4):306. https://doi.org/10.3390/min10040306

Chicago/Turabian Style

Chornkrathok, Sasithorn, Dongzhou Zhang, and Przemyslaw Dera. 2020. "Structure and Behavior of the Ni End-Member Schreibersite Ni3P under Compression to 50 GPa" Minerals 10, no. 4: 306. https://doi.org/10.3390/min10040306

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