Dislocation intersections in ionic crystals can produce both charged and uncharged jogs, m well as vacancies and interstitial ions. Dislocation reactions helped by the retarding effect of these jogs, can give rise to sessile dislocations by a zip-fastening mechanism. In this way the formation of boundaries during irrational twinning may be explained.
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Kear et al. (1959) studied this question.
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