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Temperature dependence of diffuse satellites in Ti–(50 − x)Pd–xFe (14 ⩽ x ⩽ 20 (at.%)) alloys

Journal of Alloys and Compounds
DOI: 10.1016/j.jallcom.2014.07.152
  • Martensitic Transformation
  • Precursor Phenomena
  • Phonon Softening
  • Electronic Structure


Abstract Diffuse satellites appearing in electron diffraction pattern of shape memory Ti–(50−x)Pd–xFe (14, 16, 18, 19 and 20, in at.%) alloys have been investigated. The satellites appear in each alloy below Tmin, where its electrical resistivity shows a local minimum. The positions of satellites are gB2+〈ζζ¯0〉*, where gB2 is a reciprocal lattice vector of the B2-phase. The value of ζ is smaller than 1/5 at Tmin for all the alloys; it increases with decreasing temperature and decreases with increasing iron content. The value of ζ at Tmin agrees with the length of the nesting vector previously calculated by the present authors. This result implies that Fermi surface nesting is the origin of diffuse satellites in Ti–(50−x)Pd–xFe alloys.

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