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

Highlights: • Diffuse satellites of Ti–(50 − x)Pd–xFe alloys have been investigated. • Diffuse satellites appear at g_B2 + 〈ζζ^¯0〉^* below T_min. • The peak position of diffuse satellites at T_min agree with the length of the nesting vector. • The present result implies that the nesting effect of Fermi surface originates diffuse satellites in Ti–(50 − x)Pd–xFe alloys. - 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 T_min, where its electrical resistivity shows a local minimum. The positions of satellites are g_B2 + 〈ζ ζ^¯ 0〉^*, where g_B2 is a reciprocal lattice vector of the B2-phase. The value of ζ is smaller than 1/5 at T_min for all the alloys; it increases with decreasing temperature and decreases with increasing iron content. The value of ζ at T_min 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