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Plastic deformation of ZnS crystals occurs by slip on (111) planes and is accompanied by a current due to the motion of charged dislocations. By determining the sign of this current in crystals of known absolute orientation it is shown that dislocations glide between planes with a B-type stacking and not between those with Aa-type stacking as is traditionally assumed.
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Speake et al. (1978) studied this question.
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