Abstract
X-ray diffraction, 57 Fe Mössbauer spectroscopy, and magnetic susceptibility measurements have been performed in the temperature range 4.2-293 K on the Al 70 Fe 20 Ta 10 icosahedral alloy. It was found that Fe atoms are distributed among a multiplicity of sites, which was interpreted as evidence of intrinsic disorder characteristic for icosahedral alloys. It was shown that the distribution of electric quadrupole interactions is better described by the Gaussian shape than by the shape predicted by the shell model. It was found that Al 70 Fe 20 Ta 10 is not magnetically ordered. We find that Al 70 Fe 20 Ta 10 is a paramagnet and that the claim made in the literature of the simultaneous occurrence of Curie-like and Pauli paramagnetism is an artifact resulting from previously unconsidered second phases.
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