【作者】 王达； 胡湘岳； 贝承训； 周克省；

【Author】 WANG Da~1 HU Xiang-yue~2 BEI Cheng-xun~1 ZHOU Ke-sheng~3 (1.Physics Teaching & Experiment Center,South Campus of SCUT,South China University of Technology,Guangzhou 510006,China;2.Physics Teaching & Experiment Center,Guangzhou University,Guangzhou 510006,China;3.School of Physics and Chemical Technology,Center South University,Changsha 410083,China)

【机构】 华南理工大学物理实验中心； 广州大学物理实验中心； 中南大学物理科学与技术学院；

【摘要】 采用溶胶-凝胶法制备 La_0．8Sr_0．2Mn_1-xCo_xO₃（y =0．12,0．14）,用 HP8722型网络分析仪测定样品2～ 18GHz 介电常数、复磁导率、损耗角正切及微波吸收特性曲线,发现 y=0．14,样品厚度为1．8mm,收峰值达到了17dB,10dB 以上吸收带宽达到了3．5GHz。对该材料的电磁损耗机理进行了研究,发现在频率11．2GHz 附近有突变发生,2～11．2GHz 频段损耗主要以介电损耗为主,11．2～18GHz 频段损耗是介电损耗与磁损耗共同作用的结果,其中磁损耗更大一些。更多还原

【Abstract】 The experiment of La_0.8Sr_0.2Mn_1-xCo_xO₃（y=0.12,0.14）were prepared by sol-gel process,and those complex dielectric constant,complex permeability,loss tangent and absorption coefficient in 2-18GHz microwave frequencies were measured and analyzed.The absorption mechanism of material was studied generally.The result shows that y=0.14, thickness 1.8mm there were two absorption peaks;the highest is 17dB and the effective band width of more than 10dB reaches 3.SGHz.The electromagnetic loss parameter increases or decrease suddenly at frequency about 11.2GHz,when the frequency is between 2-11.2GHz,the dielectric loss is the major loss;when the frequency is between 11.2-18GHz dielectric loss and magnetic loss are all avail,but magnetic loss bigger.更多还原