Hardness and fracture toughness of bulk single crystal gallium nitride

Lawrence Berkeley Laboratory, University of California, Berkeley, Berkeley, California, United States
Applied Physics Letters (Impact Factor: 3.52). 01/1997; 69(26):4044 - 4046. DOI: 10.1063/1.117865
Source: IEEE Xplore

ABSTRACT Basic mechanical properties of single crystal gallium nitride are measured. A Vickers (diamond) indentation method was used to determine the hardness and fracture toughness under an applied load of 2N. The average hardness was measured as 12±2 GPa and the average fracture toughness was measured as 0.79±0.10 MPa√m. These values are consistent with the properties of brittle ceramic materials and about twice the values for GaAs. A methodology for examining fracture problems in GaN is discussed. © 1996 American Institute of Physics.

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