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The mechanism of solution of aluminum oxide in MgSiO 3 perovskite
Author(s) -
Stebbins Jonathan F.,
Kroeker Scott,
Andrault Denis
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012279
Subject(s) - perovskite (structure) , octahedron , octahedral symmetry , materials science , oxide , range (aeronautics) , spectral line , mineralogy , crystallography , nuclear magnetic resonance , crystal structure , chemistry , physics , ion , metallurgy , organic chemistry , composite material , astronomy
We report 27 Al and 29 Si 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 MgSiO 3 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.