Influence of iron on phase and magnetic property of the LaFe_(11.6)Si_(1.4) compound  

作　　者：陈湘 陈云贵 唐永柏 

机构地区：[1]School of Materials Science and Engineering, Sichuan University [2]Engineering and Technology College, Neijiang Normal University

出　　处：《Journal of Rare Earths》2011年第4期354-358,共5页稀土学报（英文版）

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

摘　　要：The phase relation, microstructure, Curie temperatures, hysteresis, and magnetocaloric effects of LaFex＊11.6Si1.4 （x=0.96, 0.98, 1.0, and 1.02） compounds prepared by arc-melting and then annealed at 1423 K （1.5 h）＋1523 K （4.5 h） were investigated. The main phase was NaZn13-type phase, the impurity phases included a small amount of α-Fe and LaFeSi phase in four samples. The crystal cell parameters of 1：13 phase increased from 1.1433（5） to 1.1454（4） nm with x increasing from 0.96 to 1.02, respectively. All samples kept the typical first-order magnetic transition. The increase of Fe strengthened IEM behavior, and led to the remarkable enhancement of MCE effect and negative slopes in Arrott plots around TC. The maximum ΔSM （T, H） under a low magnetic field （0–2 T） was 15.3, 16.8, 17.9, and 24.7 J/kg K with increasing of Fe content from x=0.96 to 1.02, respectively.The phase relation, microstructure, Curie temperatures, hysteresis, and magnetocaloric effects of LaFex＊11.6Si1.4 （x=0.96, 0.98, 1.0, and 1.02） compounds prepared by arc-melting and then annealed at 1423 K （1.5 h）＋1523 K （4.5 h） were investigated. The main phase was NaZn13-type phase, the impurity phases included a small amount of α-Fe and LaFeSi phase in four samples. The crystal cell parameters of 1：13 phase increased from 1.1433（5） to 1.1454（4） nm with x increasing from 0.96 to 1.02, respectively. All samples kept the typical first-order magnetic transition. The increase of Fe strengthened IEM behavior, and led to the remarkable enhancement of MCE effect and negative slopes in Arrott plots around TC. The maximum ΔSM （T, H） under a low magnetic field （0–2 T） was 15.3, 16.8, 17.9, and 24.7 J/kg K with increasing of Fe content from x=0.96 to 1.02, respectively.

关 键 词：LaFex＊11.6Si1.4 compounds short-time and high-temperature annealing HYSTERESIS magnetocaloric effect rare earths 

分 类 号：TB34[一般工业技术—材料科学与工程]