High-pressure study on lead fluorapatite

Xi Liu; Sean R. Shieh; Michael E. Fleet; Arslan Akhmetov

doi:10.2138/am.2008.2816

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Research Article| October 01, 2008

High-pressure study on lead fluorapatite

Xi Liu;

Xi Liu

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

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Sean R. Shieh;

Sean R. Shieh *

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

*

E-mail: [email protected]

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Michael E. Fleet;

Michael E. Fleet

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

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Arslan Akhmetov

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

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Author and Article Information

Xi Liu

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

Sean R. Shieh *

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

Michael E. Fleet

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

Arslan Akhmetov

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

*

E-mail: [email protected]

Publisher: Mineralogical Society of America

Received: 06 Oct 2007

Accepted: 01 Apr 2008

First Online: 02 Mar 2017

Online ISSN: 1945-3027

Print ISSN: 0003-004X

American Mineralogist (2008) 93 (10): 1581–1584.

https://doi.org/10.2138/am.2008.2816

Abstract

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.