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Mössbauer Spectroscopy of Mg 0.9 Fe 0.1 SiO 3 perovskite
Author(s) -
Jeanloz Raymond,
O'Neill Bridget,
Pasternak Moshe P.,
Taylor R. Dean,
Bohlen Steven R.
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl02461
Subject(s) - mössbauer spectroscopy , perovskite (structure) , octahedron , materials science , ion , spectral line , crystal structure , spectroscopy , condensed matter physics , nuclear magnetic resonance , analytical chemistry (journal) , crystallography , chemistry , physics , quantum mechanics , organic chemistry , chromatography , astronomy
Ambient pressure Mössbauer spectra of Mg 0.9 57 Fe 0.1 SiO 3 perovskite synthesized at pressure‐temperature conditions of ∼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 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.
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