Abstract
Ion-thinned single crystals of nickel oxide were examined and found to contain some unusual dislocation configurations showing anomalous contrast under certain diffracting conditions. These configurations took the form of glissile dislocations threading the foil but leaving long trailing dislocations in the near surface region at both top and bottom surfaces. The Burgers vector of the dislocations was identified as ( a/2)〈110〉 as expected for nickel oxide, and the contrast anomalies were ascribed to certain surface effects. The dislocations themselves were thought to have arisen as a result of cleavage processes in the crystal, and their retention in the foil is attributed to the formation of reduced surface layers during the ion thinning.
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