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The compressibility of a natural apatite |
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| Authors: | |
| Institution: | (1) Department of Environmental Sciences, Faculty of Sciences, Ibaraki University, 2–1-1 Bunkyo, Mito Ibaraki, 310–0056, Japan;(2) Institute for Frontier Research on Earth Evolution, Japan Marine Science & Technology Center, 2–15 Natsushima, Yokosuka Kanagawa, 237–0061, Japan;(3) Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Beppu 874–0903, Japan;(4) High Energy Accelerator Research Organization, Tsukuba Ibaraki, 305–0801, Japan;(5) Present address: Department of Geology and Geophysics, Yale University, 210 Whitney Avenue, New Haven, CT06520, USA |
| Abstract: | In-situ synchrotron X-ray diffraction (XRD) experiments of a natural apatite with the formula of Ca5(PO4)3F0.94Cl0.06 were carried out using a diamond anvil cell and angle-dispersive technique at Photon Factory (PF), Japan. Pressure–volume data were collected up to 7.12 GPa at 300 K. The pressures were determined from the ruby fluorescence spectra shift. The unit-cell parameters and volume decreased systematically with increasing pressure, and a reliable isothermal bulk modulus and its pressure derivative were obtained in this study. The third-order Birch–Murnaghan equation of state yielded the isothermal bulk modulus of KT=91.5(38) GPa, its pressure derivative KT = 4.0(11), and the zero-pressure volume V0=524.2(3) Å3. |
| Keywords: | Apatite Compressibility Third-order Birch– Murnaghan equation of state Bulk modulus |
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