The B-site ordering in RFe_(0.5)Cr_(0.5)O_(3)ceramics and its effect on magnetic properties  

作　　者：Li Hou Lei Shi Liping Yang Yiqiang Liu Zhitao Li Lanxiang Meng 侯利;石磊;杨利平;刘义强;李志涛;孟蓝翔(School of Materials Science and Engineering,Anyang Institute of Technology,Anyang 455000,China;Hefei National Laboratory for Physical Sciences at Microscale,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]School of Materials Science and Engineering,Anyang Institute of Technology,Anyang 455000,China [2]Hefei National Laboratory for Physical Sciences at Microscale,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2024年第10期434-441,共8页中国物理B（英文版）

基　　金：supported by the Natural Science Foundation of Henan Province,China(Grant Nos.232300420353 and 232300420392);the Key Scientific Research Project of Higher Education of Henan Province(Grant No.24B140001);the Doctor Scientific Research Initiate Fund of Anyang Institute of Technology(Grant No.BSJ2022010);the National Basic Research Program of China(Grant No.2009CB939901);the Henan Provincial Science and Technology Research Project(Grant No.232102241016).

摘　　要：To insight into the B-site ordering in RFe_(0.5)Cr_(0.5)O_(3)ceramics,a series of RFe_(0.5)Cr_(0.5)O_(3)ceramics(R=La,Y,Lu)were synthesized by the sol-gel method,and the structural and magnetic properties were systemically investigated.By using the Rietveld refinement of all samples,it is found that the structural distortion is increased as the R ionic radius decreases,leading to the weakened interactions between Fe/Cr ions.Moreover,the Fe and Cr are arranged in disorder in LaFe_(0.5)Cr_(0.5)O_(3),but partially ordered in YFe_(0.5)Cr_(0.5)O_(3)and LuFe_(0.5)Cr_(0.5)O_(3),showing an increasing trend of the proportion of ordered domains with the decrease of R ionic radius.Through fitting the temperature-dependent magnetizations,it is identified that the magnetization reversal(MR)in disorder LaFe_(0.5)Cr_(0.5)O_(3)is resulted from the competition between the moments of Cr and Fe sublattices.In the partially ordered YFe_(0.5)Cr_(0.5)O_(3)and LuFe_(0.5)Cr_(0.5)O_(3)ceramics,because of the presence of Fe-O-Cr networks in the ordered domains whose moment is antiparallel to that of Fe-O-Fe and Cr-O-Cr in the disordered domains,the compensation temperature T_(comp)of MR is increased by nearly 50 K.These results suggest that the changing of R-site ions could be used very effectively to modify the Fe-O-Cr ordering,apart from the structural distortion,which has a direct effect on the magnetic exchange interactions in RFe_(0.5)Cr_(0.5)O_(3)ceramics.Then at values of composition where ordered domains are expected to be larger in number as compared to disordered domains and with a weaker structural distortion,one can expect a higher transition temperature Tcomp,providing a different view for adjustment of the magnetic properties of RFe_(0.5)Cr_(0.5)O_(3)ceramics for practical applications.

关 键 词：RFe_(0.5)Cr_(0.5)O_(3)ceramics structural distortion B-site ordering magnetization reversal 

分 类 号：O469[理学—凝聚态物理]