Abstract
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.
Highlights
Knowledge of the chemical composition and physical properties of the Earth’s interior comes mostly from seismic observations, geophysical modeling, direct observation of surface rocks, and the study of meteorites [1,2,3]
The atomic coordinates of Ni3P determined in our single-crystal experiment represent the opposite absolute structure configuration of the mineral, which is a well-known phenomenon for molecules or crystals without a center of symmetry or mirror
The atomic coordinates of Ni3 P determined in our single-crystal experiment represent the opposite absolute structure configuration of the mineral, which is a well-known phenomenon for molecules or crystals without a center of symmetry or mirror plane [53]
Summary
Knowledge of the chemical composition and physical properties of the Earth’s interior comes mostly from seismic observations, geophysical modeling, direct observation of surface rocks, and the study of meteorites [1,2,3]. At present, Earth’s deep interior cannot be directly sampled due to engineering limitations, as the deepest hole that has been drilled far reached only approximately 12 km [4]. Experimental investigations at high pressures and high temperatures have played an essential role in studying the Earth’s interior. The Earth’s core is believed to be comprised primarily of an iron-nickel (Fe-Ni) alloy. We know that the density of Earth’s core is approximately
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