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The crystal and magnetic properties of nickel ferrite‐aluminates are investigated with X‐ray, neutron diffraction, magnetometric, and Mössbauer effect methods. Variation of the saturation magnetic moment per molecule measured at 78 K with chemical composition is satisfactorily explained on the basis of the collinear spin ordering model and the elaborated and experimentally verified cation distributions model.

Integral and analytical formulae are derived for the shape of the background‐corrected single resonance scattering line. Nuclear resonance, Rayleigh and Compton scattering processes are taken into consideration. The thickness and resonant isotope abundance dependence of line amplitude and line width is analysed. Due to the filtrational properties of the nuclear resonance scattering process the background‐corrected scattering line amplitude reaches its highest value for a very thin sample for which the linewidth is also narrowest. The conclusions derived from the numerical analysis are supported by the experiments.