Structural distortion of CaSnO3 perovskite under pressure and the quenchable post-perovskite phase as a low-pressure analogue to MgSiO3

Shigehiko Tateno, Kei Hirose, Nagayoshi Sata, Yasuo Ohishi

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Structural distortion and the phase transition of CaSnO3 perovskite were examined in situ at high-pressure and -temperature on the basis of synchrotron X-ray diffraction measurement in a laser-heated diamond-anvil cell. The results show that CaSnO3 perovskite transforms into a CaIrO3-type post-perovskite phase above 40GPa and 2000K with a high positive Clapeyron slope. It is noted that CaSnO3 post-perovskite is quenchable to ambient condition. Combined with available compression data on other perovskite-type materials, we discuss a mechanism of perovskite to post-perovskite phase transition under pressure. The perovskites, which are distorted largely from the ideal cubic perovskite structure already at ambient condition, become more deformed with increasing pressure. This eventually results in the post-perovskite phase transition at a critical angle of octahedral rotation.

Original languageEnglish
Pages (from-to)54-59
Number of pages6
JournalPhysics of the Earth and Planetary Interiors
Volume181
Issue number1-2
DOIs
Publication statusPublished - Jul 2010
Externally publishedYes

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perovskite
low pressure
analogs
data compression
perovskites
anvils
phase transition
synchrotrons
diamonds
slopes
cells
diffraction
lasers
diamond anvil cell
x rays
temperature
transform
laser
X-ray diffraction
compression

Keywords

  • Diamond-anvil cell
  • Lower mantle
  • Perovskite
  • Phase transition
  • Post-perovskite

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Physics and Astronomy (miscellaneous)
  • Astronomy and Astrophysics

Cite this

Structural distortion of CaSnO3 perovskite under pressure and the quenchable post-perovskite phase as a low-pressure analogue to MgSiO3 . / Tateno, Shigehiko; Hirose, Kei; Sata, Nagayoshi; Ohishi, Yasuo.

In: Physics of the Earth and Planetary Interiors, Vol. 181, No. 1-2, 07.2010, p. 54-59.

Research output: Contribution to journalArticle

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AU - Sata, Nagayoshi

AU - Ohishi, Yasuo

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N2 - Structural distortion and the phase transition of CaSnO3 perovskite were examined in situ at high-pressure and -temperature on the basis of synchrotron X-ray diffraction measurement in a laser-heated diamond-anvil cell. The results show that CaSnO3 perovskite transforms into a CaIrO3-type post-perovskite phase above 40GPa and 2000K with a high positive Clapeyron slope. It is noted that CaSnO3 post-perovskite is quenchable to ambient condition. Combined with available compression data on other perovskite-type materials, we discuss a mechanism of perovskite to post-perovskite phase transition under pressure. The perovskites, which are distorted largely from the ideal cubic perovskite structure already at ambient condition, become more deformed with increasing pressure. This eventually results in the post-perovskite phase transition at a critical angle of octahedral rotation.

AB - Structural distortion and the phase transition of CaSnO3 perovskite were examined in situ at high-pressure and -temperature on the basis of synchrotron X-ray diffraction measurement in a laser-heated diamond-anvil cell. The results show that CaSnO3 perovskite transforms into a CaIrO3-type post-perovskite phase above 40GPa and 2000K with a high positive Clapeyron slope. It is noted that CaSnO3 post-perovskite is quenchable to ambient condition. Combined with available compression data on other perovskite-type materials, we discuss a mechanism of perovskite to post-perovskite phase transition under pressure. The perovskites, which are distorted largely from the ideal cubic perovskite structure already at ambient condition, become more deformed with increasing pressure. This eventually results in the post-perovskite phase transition at a critical angle of octahedral rotation.

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