The mechanism of solution of aluminum oxide in MgSiO3 perovskite

Details The mechanism of solution of aluminum oxide in MgSiO3 perovskite The mechanism of solution of aluminum oxide in MgSiO3 perovskite

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..615s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 4, p. 615-618

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10

Mineralogy And Petrology: Crystal Chemistry, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Mineral Physics: Nmr, Mossbauer Spectroscopy, And Other Magnetic Techniques

Scientific paper

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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