La_(0.9)Ce_(0.1)Fe_(11.7-x)Mn_xSi_(1.3)H_y(x=0.21,0.25)粘结复合物的磁热效应  

Magnetocaloric effects of bonded compound of La_(0.9)Ce_(0.1)Fe_(11.7-x)Mn_xSi_(1.3)H_y(x=0.21,0.25)

作　　者：李道勤 松林[1] 欧志强[1] 明明[1] 王莹[1] 黄焦宏[2] 

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：《金属功能材料》2016年第1期17-20,共4页Metallic Functional Materials

基　　金：国家自然科学基金资助(51161016)

摘　　要：通过高频悬浮炉反复熔炼,在1 363K纯氩环境下退火144h后淬火,饱和吸氢后得到母合金样品La0.9Ce0.1Fe11.7-xMnxSi1.3Hy(x=0.21,0.25)。对其进行等质量塑性粘结,得到复合物。XRD相图结果表明,母合金的主相均为NaZn13型立方结构(空间点群为Fm-3c)。由热磁曲线和磁熵变曲线可以明显看出,复合物的温变区间与两母合金相比有所增大,并且其熵变值在1.5T磁场下依然比Gd的要高很多,最高约为6.4J/(kg·K)。复合物的相对制冷能力RCP(S)值与两母合金相比略大。Appropriate amount of raw materials were melted for several times in the high frequency suspension furnace,the obtained ingots were annealed in a high purity argon atmosphere at 1 363 Kfor 144 hbefore being quenched into water.Finally,after saturated hydrogen absorption and mixing of the two parents alloys,the composite has achieved.XRD results indicate that the parent compounds mainly consist of the NaZn13-type cubic structure phase with a space group of Fm-3c.The M-Tcurves and magnetic entropy change curves show that the bonded composite has a larger temperature change interval than its parent compounds.The magnetic entropy change of the composite is much higher than that of Gd,the maximum value is about 6.4J/（kg·K）in a magnetic field change of1.5T.And the larger relative cooling power（RCP（S））of the composite is remained comparing with its parent compounds.

关 键 词：磁热效应 粘结复合物 磁熵 相对制冷能力(RCP(S)) 

分 类 号：TB33[一般工业技术—材料科学与工程]