The equation of state and the structural behavior of synthetic MgAl2O4 have been investigated using synchrotron X-ray powder diffraction data collected to 30 GPa at room temperature. The Birch-Murnaghan, Vinet, and Poirier-Tarantola models have been fitted to the observed P-V data. The Birch-Murnaghan equation of state, with V0 fixed at its experimental value, yields K0 = 190.8(±1.2) GPa, K′0 = 6.77(±0.15) and K″0 = -0.075 GPa-1 (implied value). The compression of spinel occurs with a negligible change of the fractional coordinate of oxygen. Therefore the structural shrinking is a function of cell edge shortening alone. The results presented here are compared with those from the literature.
Synthetic MgAl2O4 (spinel) at high pressure conditions (0.0001-30 GPa): a X-ray powder diffraction by synchrotron radiation / D. Levy, A. Pavese, M. Hanfland. - In: AMERICAN MINERALOGIST. - ISSN 0003-004X. - 88:1(2003), pp. 93-98. [10.2138/am-2003-0112]
Synthetic MgAl2O4 (spinel) at high pressure conditions (0.0001-30 GPa): a X-ray powder diffraction by synchrotron radiation
A. PaveseSecondo
;
2003
Abstract
The equation of state and the structural behavior of synthetic MgAl2O4 have been investigated using synchrotron X-ray powder diffraction data collected to 30 GPa at room temperature. The Birch-Murnaghan, Vinet, and Poirier-Tarantola models have been fitted to the observed P-V data. The Birch-Murnaghan equation of state, with V0 fixed at its experimental value, yields K0 = 190.8(±1.2) GPa, K′0 = 6.77(±0.15) and K″0 = -0.075 GPa-1 (implied value). The compression of spinel occurs with a negligible change of the fractional coordinate of oxygen. Therefore the structural shrinking is a function of cell edge shortening alone. The results presented here are compared with those from the literature.
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