GaAs single crystals have been indented by a Vickers indenter at room temperature and 77 K. Dislocations thereby introduced were studied using the weak-beam method of electron microscopy. The dislocations have a Burgers vector of (a/2)<110> and are dissociated into two Shockley partials. The stacking-fault energy decreases from 43 mJm~(-2) at 923 K to 15mJm~(-2) at 77K.
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