High-pressure phase transitions in FeCr2O4and structure analysis of new post-spinel FeCr2O4and Fe2Cr2O5phases with meteoritical and petrological implications

Takayuki Ishii, Hiroshi Kojitani, Shoichi Tsukamoto, Kiyoshi Fujino, Daisuke Mori, Yoshiyuki Inaguma, Noriyoshi Tsujino, Takashi Yoshino, Daisuke Yamazaki, Yuji Higo, Kenichi Funakoshi, Masaki Akaogi

Research output: Contribution to journalArticle

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Abstract

We determined phase relations in FeCr2O4at 12-28 GPa and 800-1600 °C using a multi-anvil apparatus. At 12-16 GPa, FeCr2O4spinel (chromite) first dissociates into two phases: a new Fe2Cr2O5phase + Cr2O3with the corundum structure. At 17-18 GPa, the two phases combine into CaFe2O4-type and CaTi2O4-type FeCr2O4below and above 1300 °C, respectively. Structure refinements using synchrotron X-ray powder diffraction data confirmed the CaTi2O4-structured FeCr2O4(Cmcm), and indicated that the Fe2Cr2O5phase is isostructural to a modified ludwigite-type Mg2Al2O5(Pbam). In situ high-pressure high-temperature X-ray diffraction experiments showed that CaFe2O4-type FeCr2O4is unquenchable and is converted into another FeCr2O4phase on decompression. Structural analysis based on synchrotron X-ray powder diffraction data with transmission electron microscopic observation clarified that the recovered FeCr2O4phase has a new structure related to CaFe2O4-type. The high-pressure phase relations in FeCr2O4reveal that natural FeCr2O4-rich phases of CaFe2O4-and CaTi2O4-type structures found in the shocked Suizhou meteorite were formed above about 18 GPa at temperature below and above 1300 °C, respectively. The phase relations also suggest that the natural chromitites in the Luobusa ophiolite previously interpreted as formed in the deep-mantle were formed at pressure below 12-16 GPa.

Original languageEnglish
Pages (from-to)1788-1797
Number of pages10
JournalAmerican Mineralogist
Volume99
Issue number8-9
DOIs
Publication statusPublished - Aug 1 2014

Fingerprint

phase transition
spinel
Phase transitions
X-ray diffraction
Synchrotrons
X ray powder diffraction
synchrotrons
ludwigite
diffraction
Meteorites
Chromite
chromites
x rays
corundum
Aluminum Oxide
pressure reduction
meteorites
chromite
structural analysis
decompression

Keywords

  • crystal structure
  • FeCr2O4
  • high pressure
  • ophiolite
  • phase transition
  • Post-spinel
  • Rietveld analysis
  • shocked meteorite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

High-pressure phase transitions in FeCr2O4and structure analysis of new post-spinel FeCr2O4and Fe2Cr2O5phases with meteoritical and petrological implications. / Ishii, Takayuki; Kojitani, Hiroshi; Tsukamoto, Shoichi; Fujino, Kiyoshi; Mori, Daisuke; Inaguma, Yoshiyuki; Tsujino, Noriyoshi; Yoshino, Takashi; Yamazaki, Daisuke; Higo, Yuji; Funakoshi, Kenichi; Akaogi, Masaki.

In: American Mineralogist, Vol. 99, No. 8-9, 01.08.2014, p. 1788-1797.

Research output: Contribution to journalArticle

Ishii, T, Kojitani, H, Tsukamoto, S, Fujino, K, Mori, D, Inaguma, Y, Tsujino, N, Yoshino, T, Yamazaki, D, Higo, Y, Funakoshi, K & Akaogi, M 2014, 'High-pressure phase transitions in FeCr2O4and structure analysis of new post-spinel FeCr2O4and Fe2Cr2O5phases with meteoritical and petrological implications', American Mineralogist, vol. 99, no. 8-9, pp. 1788-1797. https://doi.org/10.2138/am.2014.4736
Ishii, Takayuki ; Kojitani, Hiroshi ; Tsukamoto, Shoichi ; Fujino, Kiyoshi ; Mori, Daisuke ; Inaguma, Yoshiyuki ; Tsujino, Noriyoshi ; Yoshino, Takashi ; Yamazaki, Daisuke ; Higo, Yuji ; Funakoshi, Kenichi ; Akaogi, Masaki. / High-pressure phase transitions in FeCr2O4and structure analysis of new post-spinel FeCr2O4and Fe2Cr2O5phases with meteoritical and petrological implications. In: American Mineralogist. 2014 ; Vol. 99, No. 8-9. pp. 1788-1797.
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abstract = "We determined phase relations in FeCr2O4at 12-28 GPa and 800-1600 °C using a multi-anvil apparatus. At 12-16 GPa, FeCr2O4spinel (chromite) first dissociates into two phases: a new Fe2Cr2O5phase + Cr2O3with the corundum structure. At 17-18 GPa, the two phases combine into CaFe2O4-type and CaTi2O4-type FeCr2O4below and above 1300 °C, respectively. Structure refinements using synchrotron X-ray powder diffraction data confirmed the CaTi2O4-structured FeCr2O4(Cmcm), and indicated that the Fe2Cr2O5phase is isostructural to a modified ludwigite-type Mg2Al2O5(Pbam). In situ high-pressure high-temperature X-ray diffraction experiments showed that CaFe2O4-type FeCr2O4is unquenchable and is converted into another FeCr2O4phase on decompression. Structural analysis based on synchrotron X-ray powder diffraction data with transmission electron microscopic observation clarified that the recovered FeCr2O4phase has a new structure related to CaFe2O4-type. The high-pressure phase relations in FeCr2O4reveal that natural FeCr2O4-rich phases of CaFe2O4-and CaTi2O4-type structures found in the shocked Suizhou meteorite were formed above about 18 GPa at temperature below and above 1300 °C, respectively. The phase relations also suggest that the natural chromitites in the Luobusa ophiolite previously interpreted as formed in the deep-mantle were formed at pressure below 12-16 GPa.",
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T1 - High-pressure phase transitions in FeCr2O4and structure analysis of new post-spinel FeCr2O4and Fe2Cr2O5phases with meteoritical and petrological implications

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AU - Kojitani, Hiroshi

AU - Tsukamoto, Shoichi

AU - Fujino, Kiyoshi

AU - Mori, Daisuke

AU - Inaguma, Yoshiyuki

AU - Tsujino, Noriyoshi

AU - Yoshino, Takashi

AU - Yamazaki, Daisuke

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KW - phase transition

KW - Post-spinel

KW - Rietveld analysis

KW - shocked meteorite

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