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The equation of state and the structural behavior of synthetic MgAl 2 O 4  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 K 0  = 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 MgAl 2 O 4 (spinel) at high-pressure conditions (0.0001–30 GPa): A synchrotron X-ray powder diffraction study