Abstract
The room-temperature spectrum of grandidierite is characterized by a doublet with Δ = 1.70 mm sec−1 and δ = 1.10 mm sec−1 (relative to metallic iron) caused by Fe2+ in the five-coordinated position. The quadrupole splitting decreases with increasing Fe2+/(Fe2+ + Mg) from 1.724 mm sec−1 at Fe/(Fe+Mg) = 0.037 to 1.681 mm sec−1 at Fe/(Fe+Mg) = 0.288. The temperature dependence of the isomer shift indicates a Debye temperature of 300 ± 50 K for divalent iron in this position.
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