57Fe Mössbauer studies in a single crystal of Ni0.83Fe0.17

We have analysed our ⁵⁷Fe Mössbauer spectra in a disordered and ordered single crystal alloy of Ni_0.83Fe_0.17 using short range order parameters introduced by Cowley. The γ-rays are emitted parallel to the 〈110〉 direction. The spectra are computer fitted with a distribution of ⁵⁷Fe fields taking first and second nearest neighbour effects into account. Good agreement with experimental data has been achieved. The temperature dependences of these fields are also examined. The intensity of Δm = 0 transition of the Zeeman spectra at 300 K has been measured for the γ-rays emitted along various crystallographic directions.