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High-pressure study on lead fluorapatite

Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7, Canada

Correspondence: ^* E-mail: sshieh{at}uwo.ca

The compressional behavior of a synthetic lead fluorapatite [Pb_9.35(PO₄)₆F₂] has been investigated in situ up to about 16.7 GPa at 300 K, using a diamond-anvil cell and synchrotron X-ray diffraction. We find that the compressibility of lead fluorapatite is significantly different from that of fluorapatite [Ca₁₀(PO₄)₆F₂], chlorapatite [Ca₁₀(PO₄)₆Cl₂], and hydroxylapatite [Ca₁₀(PO₄)₆(OH)₂]: lead fluorapatite is much more compressible, and elastically isotropic in the investigated pressure range. The pressure-volume data fitted to the third-order Birch-Murnaghan equation yield an isothermal bulk modulus (K_T) of 54.3(18) GPa and the pressure derivative (K_T') of 8.1(6). If K_T' is fixed at 4, the obtained K_T is 68.4(16) GPa, which is approximately only two-thirds of the isothermal bulk modulus of the calcium apatites.

Key Words: Lead fluorapatite • compressibility • synchrotron X-ray diffraction • isothermal bulk modulus • high pressure

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