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Equation of state of Fe3+-bearing phase-X |
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| Authors: | S. Nazzareni P. Comodi L. Bindi G. Garbarino A. Bobrov |
| Affiliation: | 1. Dipartimento di Scienze della Terra, Università di Perugia, Piazza dell’Università, 06100, Perugia, Italy 2. Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121, Florence, Italy 3. CNR—Istituto di Geoscienze e Georisorse, sezione di Firenze, Via La Pira 4, 50121, Florence, Italy 4. ESRF, 6 rue Jules Horowitz, 38000, Grenoble, France 5. Department of Petrology, Geological Faculty, Moscow State University, Leninskie Gory, 119991, Moscow, Russia |
| Abstract: | We investigated the high-pressure behaviour of Fe3+-bearing hydrous phase-X, (K1.307Na0.015)(Mg1.504Fe 0.373 3+ Al0.053Ti 0.004 4+ )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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