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American Mineralogist; July 2007; v. 92; no. 7; p. 1158-1164; DOI: 10.2138/am.2007.2359
© 2007 Mineralogical Society of America
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P-V and T-V Equations of State of natural biotite: An in-situ high-pressure and high-temperature powder diffraction study, combined with Mössbauer spectroscopy

A. Pavese1,2,*, N. Curetti3, V. Diella2, D. Levy3, M. Dapiaggi1 and U. Russo4

1 Dipartimento Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23- 20133 Milano, Italy
2 National Research Council, IDPA, Section of Milan, Via Botticelli 23-20133 Milano, Italy
3 Dipartimento di Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino, Via Valperga Caluso 37-10125 Torino, Italy
4 Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1-35131 Padova, Italy

Correspondence: * E-mail: alessandro.pavese{at}unimi.it

The P-V and T-V equations of state of a natural biotite sample (Mg/Fe ratio {approx} 1) have been studied using in-situ high-pressure (0.0001–11 GPa) synchrotron radiation powder diffraction at the European Synchrotron Radiation Facilities (ESRF) in Grenoble, France, and in-situ high-temperature (298–610 K) laboratory X-ray powder diffraction. A third-order Birch-Murnaghan model [V0 = 498.7(1) Å3, measured value] provides the following elastic parameters: K0 = 49(1) GPa, K’ = 8.1(5). The volume thermal expansion is satisfactorily described by a constant value resulting in 37(2) 10–6 K–1. Mössbauer spectroscopy proves that REDOX reactions have occurred upon heating, presumably 2(OH– + Fe2+) -> 2O2– + 2Fe3+ + H2{uparrow} and/or 4Fe2+ + 2OH– + O2 -> 4Fe3+ + 3O2– + H2O. On the basis of the elastic and thermal parameters measured we have modeled the deformation contribution (Gdeform) to the Gibbs energy. The third-order Birch-Murnaghan model with V0 fixed at its experimental value and the model with refined V0 do not significantly differ from one another in terms of Gdeform. A comparison based on Gdeform between biotite and phlogopite shows a better compliance to P of the former, though balanced in mineral reactions by a difference of molar volume, i.e., V0(biotite) > V0(phlogopite).

Key Words: High-pressure studies • high-temperature studies • biotite • P-T stability






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