EXAFS studies of the local order in amorphous and crystalline nickel-zirconium alloys. II. Structure of the amorphous alloys

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Abstract
Amorphous NixZr1-x alloys with the nominal compositions x=0.241, 0.333 and 0.365 are investigated by means of extended X-ray absorption fine structure (EXAFS). Spectra were taken at both the Ni and the Zr K-absorption edges. Significant differences show up in the nearest-neighbour environment of the amorphous alloys compared with the crystalline state. The amorphous compound with x=0.333 is compared with the corresponding crystalline phase with well known CuAl2 (C16)-type structure. The Ni-Zr bond length in this amorphous alloy is 0.14 AA shorter than in the crystalline state. The small widths of the Ni-Zr atomic pair distributions in the amorphous alloys indicate a significant short-range order. A comparison of the amorphous alloys investigated shows no significant change in the environment of Ni with changing composition whereas in the Zr environment an increase of the Ni coordination number is observed with increasing Ni content.

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