X-ray diffraction study of arsenopyrite at high pressure |
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Authors: | D. W. Fan M. N. Ma W. G. Zhou S. Y. Wei Z. Q. Chen H. S. Xie |
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Affiliation: | (1) Institute of Geochemistry of Earth’s Deep Interior Materials and Fluid Interaction, Chinese Academy of Science, Guiyang, 550002, China;(2) Graduate School of Chinese Academy of Science, Beijing, 100049, China;(3) Department of GeoScience, Stony Brook University, New York, 11794, USA; |
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Abstract: | The high-pressure X-ray diffraction study of a natural arsenopyrite was investigated up to 28.2 GPa using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at National Synchrotron Light Source, Brookhaven National Laboratory. The 16:3:1 methanol–ethanol–water mixture was used as a pressure-transmitting medium. Pressures were measured using the ruby-fluorescence method. No phase change has been observed up to 28.2 GPa. The isothermal equation of state (EOS) was determined. The values of K 0, and K′ 0 refined with a third-order Birch–Murnaghan EOS are K 0 = 123(9) GPa, and K′ 0 = 5.2(8). Furthermore, we confirm that the linear compressibilities (β) along a, b and c directions of arsenopyrite is elastically isotropic (β a = 6.82 × 10−4, β b = 6.17 × 10−4 and β c = 6.57 × 10−4 GPa−1). |
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