The compression behavior of a natural fluorapatite has been investigated to about 29.2 GPa at 300K using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at High Pressure Experiment Station, Beijing Synchrotron Radiation Facility (BSRF). The unit-cell parameters and volume decreased systematically with increasing pressure, and the isothermal equation of state was determined. The values of 170, K-0, and K-0' refined with a third-order Birch-Murnaghan equation of state are V-0 = 559.7 +/- 0.8 angstrom(3), K-0 = 75 +/- 5 GPa, and K-0' = 5.6 +/- 0.7. Furthermore, we obtained that the axial compressibilities of the natural fluorapatite [3.97(8) x 10(-3) GPa(-1) and 3.12(6) x 10(-3) GPa(-1) for the a- and c-axis, respectively]. In addition, combining with previous results, the compositional dependence of the bulk modulus and its pressure derivative are discussed.

Publication name	HIGH TEMPERATURES-HIGH PRESSURES　Volume: 42　 Issue: 2　 Pages: 69-80　 Published: 2013
Author(s)	Fan, Dawei; Wei, Shuyi; Liu, Jing; Li, Yanchun; Xie, Hongsen
Corresponding author	FAN Dawei  fandawei@vip.gyig.ac.cn  Chinese Acad Sci, Inst Geochem Earths Deep Interior Mat & Fluid Int, Guiyang 550002, Peoples R China.

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