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 language | English (US) |
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Pages (from-to) | 799-804 |
Number of pages | 6 |
Journal | Mineralogical Magazine |
Volume | 60 |
Issue number | 5 |
DOIs | |
State | Published - Oct 1996 |
Keywords
- HRTEM
- Intergrowth
- MgSio perovskite
- Out-of-phase boundaries
- Satellite reflections
ASJC Scopus subject areas
- Geochemistry and Petrology