Mössbauer Spectroscopy of Mg0.9Fe0.1 SiO3 perovskite

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

doi:10.1029/92GL02461

Mössbauer Spectroscopy of Mg_0.9Fe_0.1 SiO₃ perovskite

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Ambient pressure Mössbauer spectra of Mg_0.9⁵⁷Fe_0.1SiO₃ 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 language	English
Pages (from-to)	2135-2138
Number of pages	4
Journal	Geophysical Research Letters
Volume	19
Issue number	21
DOIs	https://doi.org/10.1029/92GL02461
State	Published - 3 Nov 1992

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title = "M{\"o}ssbauer Spectroscopy of Mg0.9Fe0.1 SiO3 perovskite",

abstract = "Ambient pressure M{\"o}ssbauer 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 M{\"o}ssbauer 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.",

author = "Raymond Jeanloz and Bridget O'Neill and Pasternak, {Moshe P.} and Taylor, {R. Dean} and Bohlen, {Steven R.}",

year = "1992",

month = nov,

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doi = "10.1029/92GL02461",

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AU - Jeanloz, Raymond

AU - O'Neill, Bridget

AU - Pasternak, Moshe P.

AU - Taylor, R. Dean

AU - Bohlen, Steven R.

PY - 1992/11/3

Y1 - 1992/11/3

N2 - 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.

AB - 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.

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

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ER -

Mössbauer Spectroscopy of Mg_0.9Fe_0.1 SiO₃ perovskite

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