La_(0.8)Sr_(0.2)Mn_(1-x)NixO_3微波吸收特性  

Microwave-Absorbing Properties of La_(0.8)Sr_(0.2)Mn_(1-x)NixO_3

作　　者：王达[1] 胡湘岳[2] 贝承训[1] 周克省[3] 

机构地区：[1]华南理工大学教学科研办公室物理实验中心,广东广州510006 [2]广州大学物理与电子工程学院,广东广州510006 [3]中南大学物理科学与技术学院,湖南长沙410083

出　　处：《中国稀土学报》2007年第S1期5-8,共4页Journal of the Chinese Society of Rare Earths

基　　金：湖南省科技计划资助项目(04FJ3034)

摘　　要：采用溶胶-凝胶法制备La0.8Sr0.2Mn1-xNixO3(y=0.12,0.14),用X射线,扫描电镜对样品结构和形貌进行了表征,用HP8722型矢量网络分析仪测定样品2~18 GHz损耗角正切及微波吸收特性曲线,发现y=0.14,样品厚度2.0 mm,吸收峰值达到了14 dB,10 dB以上吸收带宽达到了3.5 GHz。对该材料的电磁损耗机理进行了研究,发现在频率12.08 GHz附近有突变发生,2~12.08 GHz频段损耗主要以介电损耗为主,12.08~18 GHz频段损耗是以磁损耗为主。The experiment of La0.8Sr0.2Mn1-xNixO3(y=0.12,0.14) were prepared by sol-gel process.The compounds were investigated by X-ray diffraction(XRD),scan election microscope(SEM),and net analyze apparatus.The result shows that y=0.12,y=0.14 have two absorption peaks.The sample of y=0.12 effective band width of more than 10 dB reach 2 GHz,and dielectric loss is the major loss.The sample of y=0.14 thickness 2 mm the highest peak is 14dB and the effective band width of more than 10 dB reach 3.5 GHz.The loss tangent ...

关 键 词：吸波材料 掺杂LaMnO3 稀土锰氧化物 

分 类 号：TB34[一般工业技术—材料科学与工程]