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231225s2019 xx |||||o 00| ||eng c |
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|a 10.1029/2019GL081922
|2 doi
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|a eng
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| 100 |
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|a Boulard, E
|e verfasserin
|4 aut
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|a Ferrous Iron Under Oxygen-Rich Conditions in the Deep Mantle
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 11.10.2023
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Recent experiments have demonstrated the existence of previously unknown iron oxides at high pressure and temperature including newly discovered pyrite-type FeO2 and FeO2Hx phases stable at deep terrestrial lower mantle pressures and temperatures. In the present study, we probed the iron oxidation state in high-pressure transformation products of Fe3+OOH goethite by in situ X-ray absorption spectroscopy in laser-heated diamond-anvil cell. At pressures and temperatures of ~91 GPa and 1,500-2,350 K, respectively, that is, in the previously reported stability field of FeO2Hx, a measured shift of -3.3 ± 0.1 eV of the Fe K-edge demonstrates that iron has turned from Fe3+ to Fe2+. We interpret this reductive valence change of iron by a concomitant oxidation of oxygen atoms from O2- to O-, in agreement with previous suggestions based on the structures of pyrite-type FeO2 and FeO2Hx phases. Such peculiar chemistry could drastically change our view of crystal chemistry in deep planetary interiors
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|a Journal Article
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|a Harmand, M
|e verfasserin
|4 aut
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|a Guyot, F
|e verfasserin
|4 aut
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|a Lelong, G
|e verfasserin
|4 aut
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|a Morard, G
|e verfasserin
|4 aut
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|a Cabaret, D
|e verfasserin
|4 aut
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| 700 |
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|a Boccato, S
|e verfasserin
|4 aut
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| 700 |
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|a Rosa, A D
|e verfasserin
|4 aut
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| 700 |
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|a Briggs, R
|e verfasserin
|4 aut
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|a Pascarelli, S
|e verfasserin
|4 aut
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|a Fiquet, G
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Geophysical research letters
|d 1984
|g 46(2019), 3 vom: 16. Feb., Seite 1348-1356
|w (DE-627)NLM098182501
|x 0094-8276
|7 nnns
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| 773 |
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|g volume:46
|g year:2019
|g number:3
|g day:16
|g month:02
|g pages:1348-1356
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|u http://dx.doi.org/10.1029/2019GL081922
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