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 T min (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 T min and its intensity maximum is located at an incommensurate position of g + ⟨ζζ0⟩*, where g is a reciprocal lattice vector of the B2-phase. The value ζ at T min is significantly smaller than 1/3 and increases with decreasing temperature; it decreases with increasing Fe content. The value of ζ at T min 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.
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