Post-perovskite transformation in germanates using sintered diamond anvils

Research output: Contribution to journalArticle

Abstract

Transformation from perovskite to post-perovskite was observed in MnGeO3 and MgGeO3 in the Kawai-type apparatus equipped with sintered diamond anvils by means of in situ X-ray diffraction method. In MnGeO3, post-perovskite phase was observed at 63.5 GPa and 1233 K. The transition pressure was ∼6 GPa higher than previous report by the laser heated diamond anvil cell experiment. In MgGeO3, we observed the transformation from perovskite to post-perovskite and the reversal transformation under the conditions of 61-64 GPa and 1100-1700 K. The phase boundary was determined to be P (GPa) = 5.2 × 10-3 T (K)+55.2, where P is pressure and T is absolute temperature, which is almost consistent with previous result by diamond anvil experiments. However, reliable pressure standard is needed to determine the boundary precisely.

Original languageEnglish
Pages (from-to)254-259
Number of pages6
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume18
Issue number3
DOIs
Publication statusPublished - 2008

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germanates
Diamond
anvils
Perovskite
Diamonds
diamonds
transition pressure
Phase boundaries
cells
diffraction
Experiments
lasers
perovskite
x rays
X ray diffraction
Lasers
temperature

Keywords

  • Germanates
  • Kawai-type apparatus
  • Post-perovskite
  • Sintered diamond anvil

ASJC Scopus subject areas

  • Chemistry (miscellaneous)

Cite this

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title = "Post-perovskite transformation in germanates using sintered diamond anvils",
abstract = "Transformation from perovskite to post-perovskite was observed in MnGeO3 and MgGeO3 in the Kawai-type apparatus equipped with sintered diamond anvils by means of in situ X-ray diffraction method. In MnGeO3, post-perovskite phase was observed at 63.5 GPa and 1233 K. The transition pressure was ∼6 GPa higher than previous report by the laser heated diamond anvil cell experiment. In MgGeO3, we observed the transformation from perovskite to post-perovskite and the reversal transformation under the conditions of 61-64 GPa and 1100-1700 K. The phase boundary was determined to be P (GPa) = 5.2 × 10-3 T (K)+55.2, where P is pressure and T is absolute temperature, which is almost consistent with previous result by diamond anvil experiments. However, reliable pressure standard is needed to determine the boundary precisely.",
keywords = "Germanates, Kawai-type apparatus, Post-perovskite, Sintered diamond anvil",
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journal = "Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu",
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publisher = "Japan Society of High Pressure Science and Technology",
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TY - JOUR

T1 - Post-perovskite transformation in germanates using sintered diamond anvils

AU - Yamazaki, Daisuke

AU - Ito, Eiji

PY - 2008

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N2 - Transformation from perovskite to post-perovskite was observed in MnGeO3 and MgGeO3 in the Kawai-type apparatus equipped with sintered diamond anvils by means of in situ X-ray diffraction method. In MnGeO3, post-perovskite phase was observed at 63.5 GPa and 1233 K. The transition pressure was ∼6 GPa higher than previous report by the laser heated diamond anvil cell experiment. In MgGeO3, we observed the transformation from perovskite to post-perovskite and the reversal transformation under the conditions of 61-64 GPa and 1100-1700 K. The phase boundary was determined to be P (GPa) = 5.2 × 10-3 T (K)+55.2, where P is pressure and T is absolute temperature, which is almost consistent with previous result by diamond anvil experiments. However, reliable pressure standard is needed to determine the boundary precisely.

AB - Transformation from perovskite to post-perovskite was observed in MnGeO3 and MgGeO3 in the Kawai-type apparatus equipped with sintered diamond anvils by means of in situ X-ray diffraction method. In MnGeO3, post-perovskite phase was observed at 63.5 GPa and 1233 K. The transition pressure was ∼6 GPa higher than previous report by the laser heated diamond anvil cell experiment. In MgGeO3, we observed the transformation from perovskite to post-perovskite and the reversal transformation under the conditions of 61-64 GPa and 1100-1700 K. The phase boundary was determined to be P (GPa) = 5.2 × 10-3 T (K)+55.2, where P is pressure and T is absolute temperature, which is almost consistent with previous result by diamond anvil experiments. However, reliable pressure standard is needed to determine the boundary precisely.

KW - Germanates

KW - Kawai-type apparatus

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KW - Sintered diamond anvil

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