La_(1-x)Ce_xFe_(11.41)Mn_(0.29)Si_(1.3)H_y粘结化合物的磁热效应  

Magnetocaloric effects of bonded La_(1-x)Ce_xFe_(11.41)Mn_(0.29)Si_(1.3)H_y compounds

作　　者：宋志强[1] 夏伟[1,2] 松林[1] 李道勤 明明[1] 黄焦宏[2] SONG Zhi-qiang;XIA Wei;SONG Lin;LI Dao-qin;MING Ming;HUANG Jiao-hong(Inner Mongolian Key Laboratory for Physics and Chemistry of Functional Materials,Inner Mongolia Normal University, Huhhot 010022, China;Baotou Research Institute of Rare Earth, Baotou 014030, China)

机构地区：[1]内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室,内蒙古呼和浩特010022 [2]包头稀土研究院,内蒙古包头014030

出　　处：《磁性材料及器件》2016年第6期14-17,31,共5页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金项目资助(51161016;51461035)

摘　　要：使用工业纯度原材料制备了La1－xCexFe11.41Mn0.29Si1.3(x=0.0,0.1,0.2和0.3)系列化合物，通过饱和吸氢得到粉末氢化物，然后使用粘结低温烧结制备出块体氢化物。结果表明：粘结化合物的相结构仍然为NaZn13型立方结构，存在第二相.-Fe。M-T曲线表明粘结化合物由铁磁态到顺磁态的转变温区变宽，由外磁场导致的巡游电子变磁转变特性明显减弱。而且居里温度TC随Ce含量x的增加而减少。在0～1.5T外磁场下粘结化合物在TC附近的最大磁熵变分别为6.55,7.46,7.78和8.88J/(kg·K)，与金属Gd最大磁熵变3.3J/(kg·K)相比大2倍左右。而最大绝热温变分别为2.4,2.6,2.6和2.8K，表明随着Ce含量的增加绝热温变与最大磁熵变均在增大。与未粘结前的合金相比，粘结后的块状化合物具有较高的强度和硬度。La1-xCexFe11.41Mn0.29Si1.3(x=0.0,0.1,0.2and0.3)alloys were synthesised using industrial purity raw materials and became powdered after saturated hydrogen absorption.Then,the block hydride compounds were obtained after low temperature sintering of the epoxy bonded ones.The epoxy bonded compounds crystallize in NaZn13-type cubic structure with a minor amount of-Fe impurity phase.After bonding,the ferromagnetic to paramagnetic transition temperature for compound became broader,and the field-induced itinerant-electron metamagnetic transition reduced.Curie temperature decreases with increasing Ce content.In a field change of0to1.5T,the maximum magnetic entropy changes around TC are6.55,7.46,7.78and8.88J/(kg·K)for x=0.0,0.1,0.2and0.3,respectively.Comparing with metal Gd,the maximum magnetic entropy change for bonded compounds are about twice larger than that of Gd(about3.3J/(kg·K)).The maximum adiabatic temperature changes are2.4,2.6,2.6and2.8K for x=0.0,0.1,0.2and0.3,respectively.Furthermore,the bonded compounds show relatively high strength,hardness and relative cooling power comparing with the non-bonded compounds.

关 键 词：粘结化合物 一级磁相变 巡游电子变磁转变 磁热性能 磁制冷材料中图法分类号:TB64 TM27文献标识码A文章编号1001-3830(06)-00014-04 

分 类 号：TB64[一般工业技术—制冷工程] TM27[一般工业技术—材料科学与工程]