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Universita di Milano, Dipartimento di Scienze della Terra, Milan, Italy
Powder neutron diffraction [ISIS Facility (U.K.), POLARIS diffractometer] was used to investigate the effect of elevated pressure on cation partitioning in synthetic Mg (sub 0.94) Al (sub 2.04) O 4 spinel. The distributions of Mg, Al, and vacancies were studied as a function of pressure, by refinement of the T-and M-site scattering lengths, and determination of the cation partitioning through numerical minimization methods. The partially disordered Mg/Al distribution, which results from the synthesis process, show an increase in ordering between 6 and 18 kbar, where Mg and Al order to the T- and M-sites, respectively. Pressure effectively tends to stabilize MgAl-spinels with a "normal structure," and this behavior is supported by numerical simulations based on classical electrostatic calculations.
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