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.
|Titolo:||Structure and compressibility of synthetic ZnAl2O4 (gahnite) under high-pressure conditions, from synchrotron X-ray powder diffraction|
PAVESE, ALESSANDRO (Secondo)
|Parole Chiave:||EoS; Structural behaviour at HP; Synthetic-gahnite|
|Settore Scientifico Disciplinare:||Settore GEO/06 - Mineralogia|
|Data di pubblicazione:||2001|
|Digital Object Identifier (DOI):||10.1007/s002690100194|
|Appare nelle tipologie:||01 - Articolo su periodico|