Hardness and fracture toughness of bulk single crystal gallium nitride
- 23 December 1996
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 69 (26) , 4044-4046
- https://doi.org/10.1063/1.117865
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.Keywords
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