La_(0.8-x)Nd_xNa_(0.2)MnO_3的磁卡效应研究  

Magnetocaloric effect in La_(0.8-x)Nd_xNa_(0.2)MnO_3

作　　者：赵秀英[1] 岳彩霞[1] 白云[1] 侯登录[1] 

机构地区：[1]河北师范大学物理科学与信息工程学院,石家庄050016

出　　处：《功能材料与器件学报》2006年第4期303-307,共5页Journal of Functional Materials and Devices

基　　金：河北省自然科学基金(No.E2005000178);河北省教育厅科研基金(No.B2003110;No.2004442)的联合资助.

摘　　要：用溶胶-凝胶法制备系列样品La0.8-xNdxNa0.2MnO3（x=0．00，0．05，0．10，0．15和0．20）钙钛矿锰氧化物。研究温度范围在240—340K、外磁场0-1T下该系列样品的居里温度和磁熵变。发现样品的居里温度Tc随x增加而减小，而且x=0．20、温度为295K时，最大磁熵变△SM为1．68J／kg·K。实验结果表明钙钛矿锰氧化物La0.8-xNdxNa0.2MnO3有可能作为室温下的磁致冷材料的候选者。Doped perovskite manganites La0.8-xNdxNa0.2MnO3 （x =0.00, 0.05, 0.10, 0.15 and 0.20） were prepared by the sol - gel method. Investigations of Curie Temperature and magnetic entropy change were carried out in the temperature range of 240 -340 K and magnetic field range of 0 -1T. It is found that the Curie Temperature Tc decreases with increasing x, and the maximum magnetic entropy change ASM（ 1.68 J/kg · K） is obtained for x =0.20 near the temperature 295 K. The results show that these perovskite manganites have some potential applications for magnetic refrigeration at room temperature.

关 键 词：类钙钛矿锰氧化物 磁致冷 磁卡效应 磁熵变 

分 类 号：O482.6[理学—固体物理]