The short-range atomic order in Fenz-zCr,,Ni, ( z = 15, 20, and 25 wt%) lloy single crystals has been studied by the x-ray diffuse scattering technique. Diffuse ring around the central node was found for all alloys. Analysis of the intensity distribution allowed t o determine the short-rangc order partial parameters. Correlations in atom arrangements in the regions of about 10-12 Angstrom in diameter were found to be characteristic for the alloys studied. It is assumed, t h a t regions of the structural short-range order become magnetic clusters a t the sufficiently low temperatures.

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Temperature dependences of the electrical resistivity, ϱ, and linear expansion, α, are investigated in Fe18Cr–(10 to 25)Ni alloys in the temperature range from 293 to 1000 K where these alloys are paramagnetic. At T > 500 K the nonlinearities of ϱ(T) and minima of α(T) are found. These high‐temperature anomalies are explained by the Weiss two‐level model, according to which the electron structure in α‐iron‐based alloys changes at high temperatures. The parameters of the two‐level model obtained from the ϱ(T) curves for the alloys studied allow one to describe the α(T) dependence of these alloys.