High temperature hardness of bulk single crystal GaN

I. Yonenaga, T. Hoshi, A. Usui

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


The hardness of single crystal GaN (gallium nitride) at elevated temperature is measured for the first time and compared with other materials. A Vickers indentation method was used to determine the hardness of crack-free GaN samples under an applied load of 0.5N in the temperature range 20 - 1200°C. The hardness is 10.8 GPa at room temperature, which is comparable to that of Si. At elevated temperatures GaN shows higher hardness than Si and GaAs. A high mechanical stability for GaN at high temperature is deduced.

Original languageEnglish
Pages (from-to)W3.90.1 - W3.90.5
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 2000 Jan 1
EventThe 1999 MRS Fall Meeting - Symposium W 'GaN and Related Alloys' - Boston, MA, USA
Duration: 1999 Nov 281999 Dec 3

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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