Observation of hidden magnesium: First-principles calculations and 25Mg solid-state NMR of enstatite
25Mg NMR parameters have been determined for two polymorphs of enstatite (MgSiO3), an important magnesium silicate phase present as a major component of the Earths upper mantle. The crystal structures of both polymorphs contain two crystallographically distinct magnesium sites; however, only a single resonance is observed in 25Mg MAS NMR spectra recorded at 14.1 and 20.0 T. First-principles calculations performed on geometry-optimised crystal structures reveal that the quadrupolar interaction...[Show more]
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|Source:||Solid State Nuclear Magnetic Resonance|
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