Iron content and temperature dependences of diffuse scattering in Ti-(50-x)Ni-xFe (6≤x≤10) alloys

Takuya Yamamoto, Mi Seon Choi, Sho Majima, Takashi Fukuda, Tomoyuki Kakeshita, Eiji Taguchi, Hirotaro Mori

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Diffuse scatterings appearing in electron diffraction patterns of Ti-(50-x)Ni-xFe (x=6, 7, 8, 10, in at.%) alloys were investigated. In the alloys, martensitic (R-phase) transformation is suppressed down to 4.2 K, but the electrical resistivity exhibits a local minimum at Tmin (210 K, 195 K, 180 K and 140 K for x=6, 7, 8, 10, respectively). The following results were obtained for all the alloys. Diffuse scattering appears below Tmin and its intensity maximum is located at an incommensurate position of g+«ζζ 0»*, where g is a reciprocal lattice vector of the B2-phase. The value ζ at Tmin is significantly smaller than 1/3 and increases with decreasing temperature; it decreases with increasing Fe content. The value of ζ at Tmin agrees with the length of nesting vector obtained by a band calculation, suggesting that the diffuse scattering is caused by the nesting effect of the Fermi surface in the B2-type structure.

Original languageEnglish
Pages (from-to)1027-1035
Number of pages9
JournalPhilosophical Magazine
Volume88
Issue number7
DOIs
Publication statusPublished - 2008 Mar

Keywords

  • Electronic structure
  • Martensitic transformation
  • Phonon softening
  • Precursor phenomena

ASJC Scopus subject areas

  • Condensed Matter Physics

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