MgSiO3 perovskite: A HRTEM study

Ishmael Hassan, Yasuhiro Kudoh, P R Buseck, Eiji Ito

Research output: Contribution to journalArticle

1 Scopus citations

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 [110]*. Another fragment shows doubled cell dimensions when viewed down [130]. 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.

Original languageEnglish (US)
Pages (from-to)799-804
Number of pages6
JournalMineralogical Magazine
Volume60
Issue number5
DOIs
StatePublished - Oct 1996

Keywords

  • HRTEM
  • Intergrowth
  • MgSio perovskite
  • Out-of-phase boundaries
  • Satellite reflections

ASJC Scopus subject areas

  • Geochemistry and Petrology

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