Slip systems in wurtzite ZnO activated by Vickers indentation on {21¯1¯0} and {101¯0} surfaces at elevated temperatures

Dislocations were introduced in wurtzite zinc oxide single crystals by Vickers indentations on {21¯1¯0} and {101¯0} surfaces at elevated temperatures, and their slip systems were determined by transmission electron microscopy combined with etch pit observations. The observed system for {21¯1¯0} indentations was {101¯1¯}〈1¯21¯0〉 or (0001)〈1¯21¯0〉, while that for {101¯0} indentations was {101¯0}〈1¯21¯0〉. Activation of the slip systems was briefly discussed in terms of the Peierls stress and resolved shear stress acting on the slip systems.