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Synthetic MgAl₂O₄ (spinel) at high-pressure conditions (0.0001–30 GPa): A synchrotron X-ray powder diffraction study

¹ Dipartimento Scienze Mineralogiche e Petrologiche-Università degli Studi di Torino, Via Valperga Caluso 35, 10025 Torino, Italy
² Dipartimento Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, 20133 Milano, Italy
³ National Research Council, IDPA, Section of Milan, Via Mangiagalli 34, 20133 Milano, Italy
⁴ European Synchrotron Radiation Facility, ESRF, F 38043 Grenoble Cedex, France

Correspondence: ^* E-mail: alessandro.pavese{at}unimi.it

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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