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Possible structural polymorphism in Al-bearing magnesiumsilicate post-perovskite

Oliver Tschauner, Boris Kiefer, Haozhe Liu, Stanislas Sinogeikin, Maddury Somayazulu and Sheng-Nian Luo
Possible structural polymorphism in Al-bearing magnesiumsilicate post-perovskite
American Mineralogist (April 2008) 93 (4): 533-539

Abstract

In the present study, we summarize indications for the existence of kinked post-perovskite structures in the MAS system. X-ray diffraction data and Raman spectra of aluminous magnesium metasilicate post-perovskite are inconsistent with the CaIrO (sub 3) structure. Instead the observations are consistent with structures intermediate between the perovskite and the CaIrO (sub 3) structure. Ab initio calculations show that the enthalpies of the kinked structures are slightly higher than the CaIrO (sub 3) structure at 0 K. Finite temperature, minor element chemistry, kinetics of phase transformation, and actual stress regime are plausible reasons for the observed differences between the present and the previously reported post-perovskite phases.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 93
Serial Issue: 4
Title: Possible structural polymorphism in Al-bearing magnesiumsilicate post-perovskite
Affiliation: University of Nevada, Department of Physics, Las Vegas, NV, United States
Pages: 533-539
Published: 200804
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 28
Accession Number: 2008-078647
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: California Institute of Technology, USA, United StatesNew Mexico State University, USA, United StatesArgonne National Laboratory, USA, United StatesResearch Academy of Science and Technology, CHN, ChinaCarnegie Institution of Washington, USA, United StatesLos Alamos National Laboratory, USA, United States
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: 200822
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