[110]TA1 Phonon Branch and Anomalous 2/3[110] Elastic Peak in Heusler and B2 Phases of a AuCuZn2 Alloy

Akira Nagasawa, Rie Yamauchi, Kazue Kita, Tomoko Makita, Yukio Morii

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The present study on the [110] TA1 phonon dispersion relation in a AuCuZn2 alloy reveals that the lattice instability towards the 18R martensite is characteristic of only the Heusler phase existing stably below about 670 K, which is the disordering temperature to the B2-phase. Anomalous peak appearing near ζ=2/3 [110] in the Heuslerphase is also examined by neutron elastic scattering experiments in a wide range of temperature. It is evident that such a peak has no relation to the 2/3-dip on the [110] TA, phonon branch observed in the Heusler-phase but it is originated from vacancies existing inherently and regularly in the B2-lattice.

Original languageEnglish
Pages (from-to)995-1000
Number of pages6
Journaljournal of the physical society of japan
Volume63
Issue number3
DOIs
Publication statusPublished - 1994 Jan 1
Externally publishedYes

Keywords

  • 2/3 [110] peak
  • 2/3-dip
  • AuCuZn2
  • B2-phase
  • Heusler-phase
  • [110] TA1 phonon branch
  • lattice instability
  • pre-martensitic state
  • vacancy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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