Abstract
Magnetic properties and hyperfine interactions of LaFe 13− x Si x intermetallic compounds with large magnetic entropy changes were investigated by means of Mössbauer spectroscopy, band structure calculation and magnetization measurements. It was found that the 57Fe magnetic hyperfine field at Fe I (8b) site is larger than that at the Fe II (96i) site, whereas the magnetic moment of Fe atoms at the Fe I site is smaller than that of Fe atoms at the Fe II site. The temperature dependence of the average 57Fe magnetic hyperfine field was found to deviate from the mean field model close to T C, implying that the first-order magnetic phase transition is predominant in the sample of LaFe 11.7Si 1.3, and consequently results in a large magnetic entropy change. Furthermore, the effect of Si substitution for Fe on hyperfine parameters was investigated.
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