Post-perovskite transitions in CaB4O3 at high pressure
被引:4
作者:
Akaogi, M.
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Gakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, JapanGakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, Japan
Akaogi, M.
[1
]
Shirako, Y.
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Gakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, JapanGakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, Japan
Shirako, Y.
[1
]
Kojitani, H.
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机构:
Gakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, JapanGakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, Japan
Kojitani, H.
[1
]
Takamori, S.
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机构:
Gakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, JapanGakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, Japan
Takamori, S.
[1
]
Yamaura, K.
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Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, JapanGakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, Japan
Yamaura, K.
[2
]
Takayama-Muromachi, E.
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机构:
Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, JapanGakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, Japan
Takayama-Muromachi, E.
[2
]
机构:
[1] Gakushuin Univ, Dept Chem, Toshima Ku, 1-5-1 Mejiro, Tokyo 1718588, Japan
[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan
来源:
INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50
|
2010年
/
215卷
关键词:
PHASE-TRANSITION;
CAIRO3;
CAPTO3;
D O I:
10.1088/1742-6596/215/1/012095
中图分类号:
TH7 [仪器、仪表];
学科分类号:
0804 ;
080401 ;
081102 ;
摘要:
High-pressure phase transitions in CaRhO3 were examined using a multianvil apparatus up to 27 GPa and 1930 degrees C. CaRhO3 perovskite transforms to post-perovskite via a monoclinic intermediate phase with increasing pressure. Volume changes for the transitions of perovskite - intermediate phase and of intermediate phase - post-perovskite are -1.1 and -0.7 %, respectively. CaRhO3 post-perovskite is the fourth quenchable post-perovskite oxide found so far. By high-temperature calorimetric experiments, enthalpy of the perovskite - post-perovskite transition in CaRuO3 was measured as 15.2 +/- 3.3 kJ/mol. Combining the datum with those of CaIrO3, it is shown that CaIrO3 perovskite is energetically less stable than CaRuO3 perovskite. This is consistent with the fact that orthorhombic distortion of CaIrO3 perovskite is larger than CaRuO3, as indicated with the tilt-angle of octahedral framework of perovskite structure. The transition pressure from perovskite to post-perovskite in CaBO3 (B = Ru, Rh, Ir) increases almost linearly with decreasing the tilt-angle, suggesting that the perovskite - post-perovskite transition may result from instability of the perovskite structure with pressure.
机构:
Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan
Jacob, KT
Okabe, TH
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Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan
Okabe, TH
Uda, T
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机构:
Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan
Uda, T
Waseda, Y
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机构:
Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan
机构:
Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan
Jacob, KT
Okabe, TH
论文数: 0引用数: 0
h-index: 0
机构:
Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan
Okabe, TH
Uda, T
论文数: 0引用数: 0
h-index: 0
机构:
Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan
Uda, T
Waseda, Y
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机构:
Tohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, JapanTohoku Univ, Inst Adv Mat Proc, Res Ctr Met Proc Engn, Res Ctr Met Proc Engn, Sendai, Miyagi 9808577, Japan