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The mechanical properties of m‐plane (10–10) GaN single crystal was measured by nanoindentation examination for the first time. Young's modulus, Berkovich hardness and conical hardness were 284.2 GPa, 15.0 GPa and 15.7 GPa for m‐plane GaN respectively. In contrast, those values in c‐plane (0001) GaN were higher such as 323.8 GPa, 20.0 GPa and 21.2 GPa, respectively. Cathodoluminescence observed dislocation...
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