首页|The B-site ordering in RFe0.5Cr0.5O3 ceramics and its effect on magnetic properties

The B-site ordering in RFe0.5Cr0.5O3 ceramics and its effect on magnetic properties

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To insight into the B-site ordering in RFe0.5Cr0.5O3 ceramics,a series of RFe0.5Cr0.5O3 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 LaFe0.5Cr0.5O3,but partially ordered in YFe0.5Cr0.5O3 and LuFe0.5Cr0.5O3,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 LaFe0.5Cr0.5O3 is resulted from the competition between the moments of Cr and Fe sublattices.In the partially ordered YFe0.5Cr0.5O3 and LuFe0.5Cr0.5O3 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 Tcomp 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 RFe0.5Cr0.5O3 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 RFe0.5Cr0.5O3 ceramics for practical applications.

RFe0.5Cr0.5O3 ceramicsstructural distortionB-site orderingmagnetization reversal

侯利、石磊、杨利平、刘义强、李志涛、孟蓝翔

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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

Natural Science Foundation of Henan Province,ChinaNatural Science Foundation of Henan Province,ChinaKey Scientific Research Project of Higher Education of Henan ProvinceDoctor Scientific Research Initiate Fund of Anyang Institute of TechnologyNational Basic Research Program of ChinaHenan Provincial Science and Technology Research Project

23230042035323230042039224B140001BSJ20220102009CB939901232102241016

2024

10.1088/1674-1056/ad641e

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(10)