Magnetic Phase Transition and Magnetic Entropy Change in La0.8Pr0.2Fe11.4Si1.6 Compound
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Wang Ligang Li Guodong Li Xiaowei Xu Chao
Key words：NaZn13-type intermetallic compound; itinerant electron magnetic (IEM) transition; magnetic entropy change;
Abstract: The magnetic properties and the phase transformation of the partial substitution of Pr for La in LaFe11.4Si1.6 have been investigated by the means of X-ray diffraction (XRD) and vibrating sample magnetic (VSM). The results indicated that the single phase NaZn13-type cubic structure is stabilized for the compound La0.8Pr0.2Fe11.4Si1.6 and large values of the isothermal magnetic entropy change △SM around the curie temperature Tc~194 K in relative low magnetic fields. The maximum value |△SM|max~37.07J/kg·K-1 under a field of 1.5 T. Such large MCEs are attributed to the sharp change of the magnetization at the Curie temperature, the field-induced IEM transition and a strong temperature dependence of the critical field BC.
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Abstract:The magnetic properties and the phase transformation of the partial substitution of Pr for La in LaFe11.4Si1.6 have been investigated by the means of X-ray diffraction (XRD) and vibrating sample magnetic (VSM). The results indicated that the single phase NaZn13-type cubic structure is stabilized for the compound La0.8Pr0.2Fe11.4Si1.6 and large values of the isothermal magnetic entropy change △SM around the curie temperature Tc~194 K in relative low magnetic fields. The maximum value |△SM|max~37.07J/kg·K-1 under a field of 1.5 T. Such large MCEs are attributed to the sharp change of the magnetization at the Curie temperature, the field-induced IEM transition and a strong temperature dependence of the critical field BC.
Key words:NaZn13-type intermetallic compound; itinerant electron magnetic (IEM) transition; magnetic entropy change;
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