Magnetocaloric properties in the Cr-doped La0.7Sr0.3MnO3 manganites
Magnetocaloric properties in the Cr-doped La0.7Sr0.3MnO3 manganites
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DOI：
10.1016/j.physb.2008.10.049
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发表时间：
2009-02
影响因子：
2.8
通讯作者：
N. Kallel;S. Kallel;Ahmed Hagaza;M. Oumezzine
中科院分区：
文献类型：
--
作者：
N. Kallel;S. Kallel;Ahmed Hagaza;M. Oumezzine
用传统的固相反应法在空气中制备了La{sub 0.7}Sr{sub 0.3}Mn{sub 1-x}Cr{sub x}O{sub 3}的单相多晶样品，其名义成分分别为x=0.00，0.20，0.40和0.50。在5-400 K温度范围和0-8 T磁场范围内进行了磁化研究。结果表明，居里温度T{sub C}随x的增加而降低，在280 K附近，在2 T和6 T磁场下，x=0.20时的最大磁熵变（-Δ S{sub M}）分别为1.203和2.653 J/kg K。
Single-phase polycrystalline samples of La{sub 0.7}Sr{sub 0.3}Mn{sub 1-x}Cr{sub x}O{sub 3} with nominal composition of x=0.00, 0.20, 0.40 and 0.50 were prepared by a conventional solid-state reaction method in air. Investigations of magnetization were carried out in the temperature range 5-400 K and magnetic field range 0-8 T. It was found that the Curie temperature T{sub C} decreases with increasing x and the maximum magnetic entropy change (-{delta}S{sub M}) for x=0.20 is {approx}1.203 and {approx}2.653 J/kg K, respectively for 2 and 6 T magnetic field near the temperature of 280 K.