Dislocation dissociation in CaGeO3 perovskite |
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| Authors: | Yanbin Wang Jean-Paul Poirier Robert C Liebermann |
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| Institution: | 1. Department of Earth and Space Sciences, State University of New York at Stony Brook, 11794, Stony Brook, NY, USA
2. Institut de Physique du Globe de Paris, 4 Place Jussieu, 05, Paris Cedex, France
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| Abstract: | Dissociated dislocations have been observed for the first time by transmission electron microscopy in the perovskite-structure compound CaGeO3. Dislocations with Burgers vectors \(\left {1\bar 10} \right]\) and 001] (in pseudo-cubic index) are dissociated into collinear partials on the (110) plane: $$\left {1\bar 10} \right] = {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\left {1\bar 10} \right] + {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\left {1\bar 10} \right]$$ and 001] = 1/2001] + 1/2001]. The partials react to form octagonal extended nodes. The stacking fault ribbons with displacement vector \(\left {1\bar 10} \right]\) have a width of 350 A, which corresponds to a stacking fault energy of 35 erg/cm2 (or mJ/m2). |
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