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Equation of state and compressibility of phlogopite by in-situ high-pressure X-ray powder diffraction

¹ Dipartimento Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, I-20133 Milano, Italy
² National Research Council, IDPA, Section of Milan, Via Botticelli 23, I-20133 Milano, Italy
³ Dipartimento di Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino, Via Valperga Caluso 37, I-10125 Torino, Italy
⁴ European Synchrotron Radiation Facility, ESRF, F-38043 Grenoble Cedex, France

^* Corresponding author, e-mail: alessandro.pavese{at}unimi.it

The elastic properties of a natural phlogopite have been studied by in-situ high-pressure X-ray powder diffraction experiments on the ID9 beamline at the ESRF, at room temperature. Several EoS models (Birch-Murnaghan, Vinet, Poirier-Tarantola) have been fitted to the experimental P-V data and the results obtained are presented and discussed. The third-order Birch-Murnaghan EoS, assuming V₀ fixed at its experimental value, yields K₀ = 49.7(±0.5) GPa, K’₀ =8.59(±0.19), K’₀ =-0.5953 GPa^–1 (implied value). The axial compressibilities at room conditions, determined by the third-order Birch-Murnaghan EoS, result in ß^EoS_a0=3.48(5), ß^EoS_b0=3.2(1), ß^EoS_c0=13.2(1) 10^–3 GPa^–1. Equilibrium thermodynamic calculations have been carried out to show how the new elastic parameters here reported affect the stability field of phlogopite.

Key-words: phlogopite, high pressure, equation of state, compressibility.

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