Abstract

X-ray diffraction patterns and nuclear gamma resonance spectra of La(Fe0.88SixAl0.12 − x)13 compounds in the paramagnetic state at room temperature have been investigated. It has been found that all samples have a cubic structure of the NaZn13 type, in which Si and Al atoms disorderly substitute for iron in the crystallographic position 96i. An analysis of the Mossbauer spectra using the fitting with doublets with different quadrupole splittings has revealed that the distributions of the aluminum and silicon impurity atoms substituting for iron differ significantly. Aluminum is statistically distributed over nine positions of the 96i type in the generalized coordination sphere of the Fe2 atom, whereas silicon predominantly substitutes for only six of the nine positions.

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