Mössbauer Spectroscopy of Mg0.9Fe0.1 SiO3 perovskite

Raymond Jeanloz, Bridget O'Neill, Moshe P. Pasternak, R. Dean Taylor, Steven R. Bohlen

Research output: Contribution to journalArticlepeer-review

Abstract

Ambient pressure Mössbauer spectra of Mg0.957Fe0.1SiO3 perovskite synthesized at pressure‐temperature conditions of ∼50 GPa and 1700 K show that the iron is entirely high‐spin Fe2+ and appears to be primarily located in the octahedral site within the crystal structure. We observe broad Mössbauer lines, suggesting a distribution of electric‐field gradients caused by disorder associated with the Fe ions. Also, the perovskite exhibits magnetic ordering at temperatures < 5 K, implying that there is a magnetic contribution to the absolute (“third‐law”) entropy of this phase.

Original languageEnglish
Pages (from-to)2135-2138
Number of pages4
JournalGeophysical Research Letters
Volume19
Issue number21
DOIs
StatePublished - 3 Nov 1992

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