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The mechanism of solution of aluminum oxide in MgSiO3 perovskite

Abstract : We report 27Al and 29Si Nuclear Magnetic Resonance (NMR) spectra, collected at magnetic fields of 14.1 and 18.8 Tesla on samples as small as 1 mg, for Al-bearing MgSiO3 perovskite synthesized at 26-28 GPa. For Al, we find a 1∶1 ratio of two types of sites: a symmetrical, octahedral site and a low symmetry, distorted site that is most likely to be Al in modifications of normally eight-coordinated Mg sites. A charge coupled substitution of 2 Al for one Si and one Mg cation is strongly supported as the predominant mechanism in this pressure range.
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Submitted on : Friday, March 4, 2022 - 4:41:07 PM
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Jonathan F. Stebbins, Scott Kroeker, Denis Andrault. The mechanism of solution of aluminum oxide in MgSiO3 perovskite. Geophysical Research Letters, American Geophysical Union, 2001, 28, pp.615-618. ⟨10.1029/2000GL012279⟩. ⟨insu-03597766⟩

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