Insight into physical processes controlling the mechanical properties of the wurtzite group-III nitride family

Ichiro Yonenaga, Momoko Deura, Y. Tokumoto, Kentaro Kutsukake, Y. Ohno

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The mechanical properties and elastic moduli of wurtzite-structured nitrides (BN, AlN, GaN and InN) and AlGaN nitride alloy are evaluated by micro- and nano-indentation studies at room temperature (RT), and the physical processes are discussed. The hardness of BN, AlN, GaN and InN varies depending on the a-axis lattice constant a as an (n ∼ −6), whereas the Young's, shear and bulk moduli of the nitrides vary as an (n ∼ −5). The properties are governed by the atomic bonding. A homology of indentation hardness scaled using the shear modulus and the magnitude of the Burgers vector for the nitrides is observed. The yield strength and stress-intensity factor of the nitrides at RT are presumed. The alloy-hardening effect in AlGaN alloy is weak compared with that in InGaN alloy.

Original languageEnglish
Pages (from-to)23-27
Number of pages5
JournalJournal of Crystal Growth
Volume500
DOIs
Publication statusPublished - 2018 Oct 15

Keywords

  • A1. Elastic moduli
  • A1. Hardness
  • A1. Indentation
  • B1. Nitride alloys
  • B1. Nitrides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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