Magnetocaloric effect and magnetic properties of La_(0.9)Ce_(0.1)(Fe_(0.99)Mn_(0.01))_(11.6)Si_(1.4)H_(1.6) compound

作     者：王超伦 龙毅 马涛 张虎 

作者机构：School of Materials Science and EngineeringUniversity of Science and Technology Beijing 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2011年第29卷第5期

页      面：474-476页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Project supported by the National Basic Research Program of China (2006CB601101) the National High Technology Research and Development Program of China (2007AA03Z440) the National Natural Science Foundation of China (50731007) 

主　　题：homogeneity of hydrogen absorption magnetocaloric effect magnetic entropy change rare earths 

摘      要：Magnetocaloric effect and magnetic properties of La0.9Ce0.1（Fe0.99Mn0.01）11.6Si1.4 and its hydride La0.9Ce0.1（Fe0.99Mn0.01）11.6Si1.4H1.6 were investigated. The Curie temperature of La0.9Ce0.1（Fe0.99Mn0.01）11.6Si1.4 was increased by hydrogen absorption. XRD patterns showed that the structure of La0.9Ce0.1（Fe0.99Mn0.01）11.6Si1.4H1.6 remained NaZn13-type. The Curie temperature （TC） of the sample was increased from 174 K to 331 K. The homogeneity of the hydrogen absorption for La0.9Ce0.1（Fe0.99Mn0.01）11.6Si1.4H1.6 was proven very well by the random measurement of DSC. The magnetic entropy △SM of La0.9Ce0.1（Fe0.99Mn0.01）11.6Si1.4H1.6 had peak at 326 K. The peak value of-△SM-was 12.3 and 7.8 J/（kg.K） under magnetic field change of 0–2 T and 0–1 T,respectively,which was comparable with Gd5Si2Ge2. The negative slope and inflection point of the Arrott curve indicated that the first-order magnetic transition of La0.9Ce0.1（Fe0.99Mn0.01）11.6Si1.4 was reserved after hydrogen absorption.