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Structure and compressibility of synthetic ZnAl2O4 (gahnite) under high-pressure conditions, from synchrotron X-ray powder diffraction |
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| Authors: | D Levy A Pavese A Sani V Pischedda |
| Institution: | Dipartimento Scienze Mineralogiche e Petrologiche-Università degli Studi di Torino, Via Valperga Caluso 35, 10025 Torino, Italy, IT Dipartimento Scienze della Terra-Università degli Studi di Milano, Via Botticelli 23, 20133 Milano, Italy?e-mail: alessandro.pavese@unimi.it?Tel.: +39-02-23698321; Fax: +39-02-70638681, IT European Synchrotron Radiation Facility, ESRF-F 38043, Grenoble Cedex, France, FR |
| 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 K 0=201.7(±0.9) GPa, K ′ 0=7.62(±0.09) and K ″ 0=−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=0, respectively], and the␣polyhedral volume compressibilities of the four-␣and␣sixfold coordination sites 0.0057(2) and 0.0041(2) GPa−1 at P=0, respectively] are discussed. Received: 15 January 2001 / Accepted: 23 April 2001 |
| Keywords: | Synthetic-gahnite EoS Structural behaviour at HP |
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