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 language | English |
|---|---|
| Pages (from-to) | 54-59 |
| Number of pages | 6 |
| Journal | Physics of the Earth and Planetary Interiors |
| Volume | 181 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Jul 2010 |
| Externally published | Yes |
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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 journal › Article
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TY - JOUR
T1 - Structural distortion of CaSnO3 perovskite under pressure and the quenchable post-perovskite phase as a low-pressure analogue to MgSiO3
AU - Tateno, Shigehiko
AU - Hirose, Kei
AU - Sata, Nagayoshi
AU - Ohishi, Yasuo
PY - 2010/7
Y1 - 2010/7
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.
KW - Diamond-anvil cell
KW - Lower mantle
KW - Perovskite
KW - Phase transition
KW - Post-perovskite
UR - http://www.scopus.com/inward/record.url?scp=77953286571&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77953286571&partnerID=8YFLogxK
U2 - 10.1016/j.pepi.2010.03.003
DO - 10.1016/j.pepi.2010.03.003
M3 - Article
AN - SCOPUS:77953286571
VL - 181
SP - 54
EP - 59
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
IS - 1-2
ER -