Abstract
We investigated the high-pressure behaviour of Fe3+-bearing hydrous phase-X, (K1.307Na0.015)(Mg1.504Fe 3+0.373 Al0.053Ti 4+0.004 )Si2O7H0.36, up to 34 GPa at room temperature by synchrotron X-ray powder diffraction. The lattice parameters behave anisotropically, with the [001] direction stiffer than [100]. In the 10−4 to 22 GPa pressure range, the axial bulk moduli are K 0a = 112(3) GPa and K′ = 4, and K 0c = 158(2) GPa and K′ = 4, and the anisotropy of the lattice parameters is β0c :β0a = 0.71:1. The cell volumes are fitted by a second-order Birch–Murnaghan equation of state giving a bulk modulus of K 0 = 127(1) GPa and K′ = 4 in the same pressure range. After 22 GPa, a discontinuity in volume and lattice parameters can be recognized. Sample did not become amorphous up to 34 GPa. The coupled substitution K + Mg = [] + Fe3+ has only a limited influence on the bulk modulus and structural stability of phase-X.
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Acknowledgments
M. Mezouar and ID27 beamline are greatly acknowledged for assistance during the experiments at ESRF (Grenoble) and fruitful discussions. European Synchrotron Radiation Facility is acknowledged for allocating beamtime. This study was partly supported by the Foundation of the President of the Russian Federation (Project MD-534.2011.5). We thank the Editor Milan Rieder, Oleg Safonov and one anonymous referee for constructive comments, which helped to improve the manuscript.
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Nazzareni, S., Comodi, P., Bindi, L. et al. Equation of state of Fe3+-bearing phase-X. Phys Chem Minerals 39, 553–559 (2012). https://doi.org/10.1007/s00269-012-0511-2
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DOI: https://doi.org/10.1007/s00269-012-0511-2