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MgSiO3 perovskite: a HRTEM study

Published online by Cambridge University Press:  05 July 2018

Ishmael Hassan ,
Yasuhiro Kudoh ,
Peter R. Buseck  and
Eui Ito
Ishmael Hassan
Affiliation:
Department of Geology, Faculty of Science, University of Kuwait, P. O. Box 5969, Safat, Kuwait, 13060
Yasuhiro Kudoh
Affiliation:
Department of Petrology, Mineralogy, and Economic Geology, University of Tohoku, Aobaku, Sendai 980, Japan
Peter R. Buseck
Affiliation:
Departments of Geology and Chemistry, Arizona State University, Tempe, Arizona 85287, U.S.A.
Eui Ito
Affiliation:
Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682-02, Japan
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Abstract

Selected-area electron diffraction patterns for the [110] zone of MgSiO3 perovskite are consistent with the orthorhombic unit cell obtained by X-ray diffraction (a = 4.775, b = 4.929, c = 6.897 Å). Various areas of a crystal fragment show diffuse streaking along c*, and well-developed satellite reflections that give a 3-fold repeat along [10]*. Another fragment shows doubled cell dimensions when viewed down [30]. The variable occurrence of the satellite reflectioncs and diffuse streaking indicate subtle variations in ordering, chemistry, or both. Images obtained by high-resolution transmission electron microscopy contain perfectly ordered regions, out-of-phase boundaries, and intergrowths of the two orthorhombic forms of perovskite.

Keywords

MgSiO3perovskiteHRTEMsatellite reflectionssatellite reflectionsintergrowthout-of-phase boundaries
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 402 , October 1996 , pp. 799 - 804
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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