The structural behavior of synthetic gahnite (ZnAl2O4) has been investigated by X-ray powder diffraction at high pressure (0-43 GPa) and room temperature, on the ID9 beamline at ESRF. The equation of state of gahnite has been derived using the models of Birch-Murnaghan, Vinet and Poirier-Tarantola, and the results have been mutually compared (the elastic bulk modulus and its derivatives versus P determined by the third-order Birch-Murnaghan equation of state are K0 = 201.7(±0.9) GPa, K10 = 7.62(±0.09) and K110 = -0.1022 GPa-1 (implied value). The compressibilities of the tetrahedral and octahedral bond lengths [0.00188(8) and 0.00142(5) GPa-1 at P = O, respectively], and the polyhedral volume compressibilities of the four- and sixfold coordination sites [0.0057(2) and 0.0041 (2) GPa-1 at P = O, respectively] are discussed.

Structure and compressibility of synthetic ZnAl2O4 (gahnite) under high-pressure conditions, from synchrotron X-ray powder diffraction / D. Levy, A. Pavese, A. Sani, V. Pischedda. - In: PHYSICS AND CHEMISTRY OF MINERALS. - ISSN 0342-1791. - 28:9(2001), pp. 612-618.

Structure and compressibility of synthetic ZnAl2O4 (gahnite) under high-pressure conditions, from synchrotron X-ray powder diffraction

A. Pavese
Secondo
;
2001

Abstract

The structural behavior of synthetic gahnite (ZnAl2O4) has been investigated by X-ray powder diffraction at high pressure (0-43 GPa) and room temperature, on the ID9 beamline at ESRF. The equation of state of gahnite has been derived using the models of Birch-Murnaghan, Vinet and Poirier-Tarantola, and the results have been mutually compared (the elastic bulk modulus and its derivatives versus P determined by the third-order Birch-Murnaghan equation of state are K0 = 201.7(±0.9) GPa, K10 = 7.62(±0.09) and K110 = -0.1022 GPa-1 (implied value). The compressibilities of the tetrahedral and octahedral bond lengths [0.00188(8) and 0.00142(5) GPa-1 at P = O, respectively], and the polyhedral volume compressibilities of the four- and sixfold coordination sites [0.0057(2) and 0.0041 (2) GPa-1 at P = O, respectively] are discussed.
EoS; Structural behaviour at HP; Synthetic-gahnite
Settore GEO/06 - Mineralogia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/179483
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