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High-pressure experiments on phase transition boundaries between corundum, Rh (sub 2) O (sub 3) (II)-and CaIrO (sub 3) -type structures in Al (sub 2) O (sub 3)

Jinya Kato, Kei Hirose, Haruka Ozawa and Yasuo Ohishi
High-pressure experiments on phase transition boundaries between corundum, Rh (sub 2) O (sub 3) (II)-and CaIrO (sub 3) -type structures in Al (sub 2) O (sub 3)
American Mineralogist (February 2013) 98 (2-3): 335-339

Abstract

Phase transitions in Al (sub 2) O (sub 3) between corundum Rh (sub 2) O (sub 3) (II)-type and CaIrO (sub 3) -type (post-perovskitetype) phases were examined at high pressure and high temperature in a laser-heated diamond-anvil cell (DAC) based on in situ X-ray diffraction measurements. The locations of corundum-Rh (sub 2) O (sub 3) (II) and Rh (sub 2) O (sub 3) (II)-CaIrO (sub 3) boundaries were precisely determined by conducting both forward and backward reaction experiments. The results demonstrate that corundum undergoes a phase transition to Rh (sub 2) O (sub 3) (II)-type structure above 106 GPa at 1800 K with a negative Clapeyron slope of -6.5 + or - 1.5 MPa/K, generally consistent with earlier experimental and theoretical works. The Rh (sub 2) O (sub 3) (II)-type phase further transforms into CaIrO (sub 3) -type above 170 GPa at 2300 K, indicating the transition pressure much higher than earlier experimental work but in agreement with reported GGA calculations. The Clapeyron slope of this phase transition was found to be high negative (-20 + or - 5 MPa/K).


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 98
Serial Issue: 2-3
Title: High-pressure experiments on phase transition boundaries between corundum, Rh (sub 2) O (sub 3) (II)-and CaIrO (sub 3) -type structures in Al (sub 2) O (sub 3)
Affiliation: Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan
Pages: 335-339
Published: 201302
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 25
Accession Number: 2013-025180
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Japan Synchrotron Radiation Research Institute, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201316
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