溶胶-凝胶法制备的La_xSr_(1-x)MnO_3纳米粉末微波吸收特性研究  

Study on Microwave Absorption Properties of La_xSr_(1-x)MnO_3 by Sol-gol Method

作　　者：杨军[1] 云月厚[1] 李国栋[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,内蒙古呼和浩特010021

出　　处：《稀土》2010年第3期67-70,共4页Chinese Rare Earths

基　　金：教育部"春晖计划"科研合作项目资助(Z2007-1-01031);内蒙古自然科学基金项目资助(20080404MS0807)

摘　　要：采用溶胶-凝胶法制备了稀土锰氧化物LaxSr1-xMnO3(x=0.5,0.7,0.9)纳米粉末,用XRD分析了该材料的相结构,并用AV3618型微波矢量网络分析仪测试了样品在8.2GHz^12.5GHz范围内的微波吸收特性。结果表明,在1000℃焙烧后样品出现单一的钙钛矿型结构,当材料涂层厚度为1mm、x=0.7时,La0.7Sr0.3MnO3的吸波性能最佳。在测试频段内有五个明显的吸收峰,最高吸收峰在11.2GHz处,其吸收峰值达34dB,20 dB以上频带宽度达3GHz,是一种有发展前景的微波吸收材料。LaxSr1-xMnO3（x=0.5,0.7,0.9） were prepared by the Sol-gel technique method.The crystalline structure was investigated by XRD,it has been showed uniform perovskite structure after calcining at 1000℃ for 3h.Microwave absorption properties in the range of 8.2～12.5GHz were measured by AV3618 net analyzing apparatus.It shows that the content changing of La would affect the microwave absorbing properties.When the thickness of LaxSr1-xMnO3 is 1.0 mm and x=0.7,the capability of microwave absorbing is the best.There are five absorption peaks.The maximum absorption quantity is 34dB when the frequency is 11.2GHz,and effective band width reaches 3GHz above 20dB.

关 键 词：溶胶-凝胶法 稀土锰氧化物 吸波特性 

分 类 号：TM25[一般工业技术—材料科学与工程] TB34[电气工程—电工理论与新技术]