Hardness and fracture toughness of bulk single crystal gallium nitride

Journal Article · Sat Nov 30 23:00:00 EST 1996 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.117865· OSTI ID:404782

Drory, M D ^[1]; Ager, III, J W ^[2]; Suski, T; Grzegory, I; Porowski, S ^[3]

---

1. Crystallume, 3506 Bassett Street, Santa Clara, California 95054 (United States)
2. Center for Advanced Materials, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
3. Unipress, Polish Academy of Sciences, 01-142 Warszawa (Poland)

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{plus_minus}2 GPa and the average fracture toughness was measured as 0.79{plus_minus}0.10 MPa{radical}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. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 404782
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 69; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
FRACTURE PROPERTIES
GALLIUM NITRIDES
HARDNESS
INDENTATION
LASER MATERIALS
MONOCRYSTALS
VERY HIGH PRESSURE