Freshly cleaved (001) surfaces of the mineral galena, PbS, were examined by scanning tunneling microscopy (STM) in vacuum. Atomically resolved images in real space showing areas with perfect order and with edge dislocations were obtained. The observed dislocations have Burgers vectors $a(1,0,0)$ and 1/2a(1,0,0) where [100] is the cleaving direction.
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Zheng et al. (1988) studied this question.
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