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- W2289574807 abstract "In the Earth’s mantle, the mechanism(s) of solid solution of Al in MgSiO3 perovskite strongly impacts its thermodynamic and transport properties. We present 27Al NMR data for perovskite samples of nominal composition Mg(Si0.9Al0.1)O2.95, to test a mechanism by which Al3+ substitutes at the octahedral Si4+ sites, leaving a corresponding number of O-site vacancies. We find evidence for this process in a significantly greater peak area for Al at B (Si) sites vs. A (Mg) sites in the structure, and the possible identification of a small concentration of five-coordinated Al adjacent to such vacancies. However, substitution of Al3+ at the A sites remains significant. As in perovskite-type technological ceramics, O-atom vacancies may play an important role in enhancing ion mobility and the dissolution of water." @default.
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- W2289574807 date "2003-07-01" @default.
- W2289574807 modified "2023-09-27" @default.
- W2289574807 title "Aluminum substitution in MgSiO<sub>3</sub>perovskite: Investigation of multiple mechanisms by<sup>27</sup>Al NMR: Figure 1." @default.
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- W2289574807 doi "https://doi.org/10.2138/am-2003-0724" @default.
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