Influence of A-site doping barium on structure,magnetic and microwave absorption properties of LaFeO_(3)ceramics powders  

作　　者：Lei Huang Lichun Cheng Shunkang Pan Qingrong Yao Qianxin Long Man Wang Yucheng Chen Huaiying Zhou 

机构地区：[1]School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China [2]Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,China

出　　处：《Journal of Rare Earths》2022年第7期1106-1117,共12页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51871066);Innovation Project of GUET Graduate Education(2020YCXS115);Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing(GXKL06170107);Talents Project of Guilin University of Electronic Technology and Guangxi Key Laboratory of Information Materials(201024-Z,191016-K,191010-Z)。

摘　　要：In this paper,the effect of Ba^(2+)ions A-site doping LaFeO_(3)on structure,magnetic properties and microwave absorption properties was investigated by the sol-gel method.According to the TEM and FullProf refinement results,the structure of LaFeO_(3)changes from orthogonal(SG:Pnma)to cubic(SG:Pm-3 m)when the Ba doping amount is x=0.4.The SEM image shows that the particles size tends to decrease with the increase of Ba content.The production of weak ferromagnetism indicates that Ba doping has a significant effect on the magnetic properties of LaFeO_(3).The Neel temperature(TN)decreases significantly with the increase of Ba doping amount.An appropriate amount of Ba doping can effectively increase the dielectric and magnetic loss of LaFeO_(3)ceramics powders.The increase permittivity(ε’andε″)may be attributed to the hopping of the electrons between the Fe^(3+)and Fe^(4+)ions with the Ba^(2+)ions doping.The minimum reflection loss(RL_(min))of La_(0.9)Ba_(0.1)FeO_(3)at 6.72 GHz reaches-30.04 dB,its effective bandwidth(RL≤-10 dB)is 2.1 GHz,and the matching thickness is only 3.2 mm.These results indicate that Ba doping can effectively control the microwave absorption properties of LaFeO_(3),especially in the Cband.

关 键 词：LaFeO_(3)ceramics Crystal structure MAGNETIC Electromagnetic parameters Microwave absorption Rare earths 

分 类 号：TQ174.1[化学工程—陶瓷工业]