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Dislocation dissociation in CaGeO3 perovskite

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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] = 1/2[001] + 1/2[001]. 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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Authors and Affiliations

  1. Department of Earth and Space Sciences, State University of New York at Stony Brook, 11794, Stony Brook, NY, USA

    Yanbin Wang & Robert C. Liebermann

  2. Institut de Physique du Globe de Paris, 4 Place Jussieu, 05, Paris Cedex, France

    Jean-Paul Poirier

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  1. Yanbin Wang
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  2. Jean-Paul Poirier
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  3. Robert C. Liebermann
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Wang, Y., Poirier, JP. & Liebermann, R.C. Dislocation dissociation in CaGeO3 perovskite. Phys Chem Minerals 16, 630–633 (1989). https://doi.org/10.1007/BF00223310

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  • DOI: https://doi.org/10.1007/BF00223310

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