ATO4 compounds are a class of oxides which includes, among others, the rare-earth elements bearing phosphates and arsenates, REEPO4 and REEAsO4. In this study, we have investigated the isothermal high-pressure and the isobaric high-temperature behaviour of natural samples of xenotime-(Y) (ideally YPO4), chernovite-(Y) (YAsO4) and monazite-(Ce) (CePO4) from the hydrothermal veins outcropping at Mt. Cervandone (Western Italian Alps). Experimental data based on in situ X-ray diffraction (both single-crystal and powder techniques with conventional or synchrotron radiation) allow to fit the unit-cell volumes and axial thermal and compressional evolution and provide a suite of refined thermo-elastic parameters. A comprehensive analysis of the role played by the crystal chemistry on the thermo-elastic response of these minerals is discussed, along with the description of the main crystal-structural deformation mechanisms for both the zircon (xenotime and chernovite) and monazite (monazite) structural types. Pressure-induced phase transitions of xenotime-(Y) and chernovite-(Y) are discussed and compared with previous literature data, whereas a change in the compressional behaviour of monazite-(Ce) at ~ 18 GPa, involving an increase in the coordination number of the REE-hosting A site, is presented and discussed.
Comparative thermal and compressional behaviour of natural xenotime-(Y), chernovite-(Y) and monazite-(Ce) / F. Pagliaro, D. Comboni, T. Battiston, H. Krüger, C. Hejny, V. Kahlenberg, L. Gigli, K. Glazyrin, H. Liermann, G. Garbarino, D. Gatta, P. Lotti. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - 88:6(2024 Dec), pp. 682-697. [10.1180/mgm.2024.70]
Comparative thermal and compressional behaviour of natural xenotime-(Y), chernovite-(Y) and monazite-(Ce)
F. PagliaroCo-primo
;D. ComboniCo-primo
;T. Battiston;D. GattaPenultimo
;P. Lotti
Ultimo
2024
Abstract
ATO4 compounds are a class of oxides which includes, among others, the rare-earth elements bearing phosphates and arsenates, REEPO4 and REEAsO4. In this study, we have investigated the isothermal high-pressure and the isobaric high-temperature behaviour of natural samples of xenotime-(Y) (ideally YPO4), chernovite-(Y) (YAsO4) and monazite-(Ce) (CePO4) from the hydrothermal veins outcropping at Mt. Cervandone (Western Italian Alps). Experimental data based on in situ X-ray diffraction (both single-crystal and powder techniques with conventional or synchrotron radiation) allow to fit the unit-cell volumes and axial thermal and compressional evolution and provide a suite of refined thermo-elastic parameters. A comprehensive analysis of the role played by the crystal chemistry on the thermo-elastic response of these minerals is discussed, along with the description of the main crystal-structural deformation mechanisms for both the zircon (xenotime and chernovite) and monazite (monazite) structural types. Pressure-induced phase transitions of xenotime-(Y) and chernovite-(Y) are discussed and compared with previous literature data, whereas a change in the compressional behaviour of monazite-(Ce) at ~ 18 GPa, involving an increase in the coordination number of the REE-hosting A site, is presented and discussed.File | Dimensione | Formato | |
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