Moessbauer spectroscopy of Mg(0.9)Fe(0.1)SiO3 perovskite

Details Moessbauer spectroscopy of Mg(0.9)Fe(0.1)SiO3 perovskite Moessbauer spectroscopy of Mg(0.9)Fe(0.1)SiO3 perovskite

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2135j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 21, p. 2135-2138.

Physics

5

Earth Mantle, Mineralogy, Mossbauer Effect, Perovskites, Crystallography, Geochemistry, Iron 57

Scientific paper

Ambient pressure Moessbauer spectra of Mg(0.9)Fe-57(0.1)SiO3 perovskite synthesized at pressure-temperature conditions of about 50 GPa and 1700 K show that the iron is entirely high-spin Fe(2+) and appears to be primarily located in the octahedral site within the crystal structure. We observe broad Moessbauer lines, suggesting a distribution of electric-field gradients caused by disorder associated with the Fe ions. Also, the perovskite exhibits magnetic ordering at temperatures lower than 5 K, implying that there is a magnetic contribution to the absolute ('third-law') entropy of this phase.

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