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 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing

出　　处：《Journal of Rare Earths》2011年第5期474-476,共3页稀土学报（英文版）

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)

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.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.

关 键 词：homogeneity of hydrogen absorption magnetocaloric effect magnetic entropy change rare earths 

分 类 号：TM271[一般工业技术—材料科学与工程]