Effect of R substitution on magnetic properties and magnetocaloric effects of La1-xRxFe11.5Si1.5 compounds with R=Ce, Pr and Nd
Shen Jun(沈俊)a)b)† , Li Yang-Xian(李养贤)b), Sun Ji-Rong(孙继荣)a), and Shen Bao-Gen(沈保根)a)
aState Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, ChinaSchool of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; b School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China
Abstract Magnetic properties and magnetocaloric effects of La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$ ($R$=Pr, ($0 \le x \le 0.5$); $R$ = Ce and Nd, ($0 \le x \le 0.3$)) compounds are investigated. Partially replacing La with $R$ = Ce, Pr and Nd in La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$ leads to a reduction in Curie temperature due to the lattice contraction. The substitution of $R$ for La causes an enhancement in field-induced itinerant electron metamagnetic transition, which leads to a remarkable increase in magnetic entropy change $\Delta S_{\rm m}$ and also in hysteresis loss. However, a high effective refrigerant capacity $RC_{\rm eff}$ is still maintained in La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$. In the present samples, a large $\Delta S_{\rm m}$ and a high $RC_{\rm eff}$ have been achieved simultaneously.
Received: 29 September 2008
Accepted manuscript online:
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by the
National Basic Research Program of China (Grant No 2006CB601101),
the National Natural Science Foundation of China (Grant Nos 50731007
and 50571112) and the Knowledge Innovation Project of
Chinese Academy of Sciences.
Cite this article:
Shen Jun(沈俊), Li Yang-Xian(李养贤), Sun Ji-Rong(孙继荣), and Shen Bao-Gen(沈保根) Effect of R substitution on magnetic properties and magnetocaloric effects of La1-xRxFe11.5Si1.5 compounds with R=Ce, Pr and Nd 2009 Chin. Phys. B 18 2058
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