1:13 phase formation mechanism and first-order magnetic transition strengthening characteristics in(La,Ce)Fe13–xSix alloys  

作　　者：Xiang Chen Yun-Gui Chen Yong-Bo Tang Ding-Quan Xiao 

机构地区：[1]College of Engineering and Technology,Neijiang Teachers Normal University,Neijiang 641002,China [2]School of Materials Science and Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Rare Metals》2016年第9期691-700,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51176050);the Research Projects in Sichuan Province Education Office(No.12ZB073)

摘　　要：The effects of the introduction of Ce to La（1-x）CexFe（11.5）Si（1.5） alloys on 1：13 phase formation mechanism,the first-order magnetic phase transition strengthening characteristics,and magnetocaloric property were studied,respectively.The results show that the formation mechanisms of 1：13 and La Fe Si phases in La（1-x）CexFe（11.5）Si（1.5） alloys are the same as those of Ce2Fe（17） and CeFe2 phases in Ce–Fe binary system,respectively.The substitution of Ce in 1：13 phase which is limited can make the first-order magnetic phase transition characteristics strengthen,which can make thermal and magnetic hysteresis increase,the temperature interval of temperatureinduced phase transition decrease,and the critical magnetic field of field-induced magnetic phase transition（HC）increase,respectively.Owing to the lattice shrink of 1：13phase with the increase in Ce content,the Curie temperatures（TC） show a linear decrease.The maximum change in magnetic entropy gradually increases due to the decrease in temperature interval of temperature-induced phase transition,but the relative cooling capacities are all about80 Jákg-1at magnetic field of 2 T.The effects of the introduction of Ce to La（1-x）CexFe（11.5）Si（1.5） alloys on 1：13 phase formation mechanism,the first-order magnetic phase transition strengthening characteristics,and magnetocaloric property were studied,respectively.The results show that the formation mechanisms of 1：13 and La Fe Si phases in La（1-x）CexFe（11.5）Si（1.5） alloys are the same as those of Ce2Fe（17） and CeFe2 phases in Ce–Fe binary system,respectively.The substitution of Ce in 1：13 phase which is limited can make the first-order magnetic phase transition characteristics strengthen,which can make thermal and magnetic hysteresis increase,the temperature interval of temperatureinduced phase transition decrease,and the critical magnetic field of field-induced magnetic phase transition（HC）increase,respectively.Owing to the lattice shrink of 1：13phase with the increase in Ce content,the Curie temperatures（TC） show a linear decrease.The maximum change in magnetic entropy gradually increases due to the decrease in temperature interval of temperature-induced phase transition,but the relative cooling capacities are all about80 Jákg-1at magnetic field of 2 T.

关 键 词：La1-xCexFe1 5Si1 5alloys Short-time annealing Large magnetocaloric effect Magnetocaloric materials 

分 类 号：TG132.27[一般工业技术—材料科学与工程]