钙钛矿型La_(1-x)Ba_xMnO_3(0≤x≤0.5)的红外发射率和微波吸收性能  

Infrared Emissivities and Microwave Absorption Properties of Perovskite La_(1-x)Ba_xMnO_3(0≤x≤0.5)

作　　者：刘嘉玮[1] 王建江[1] 许宝才[1] 侯永申 高海涛[1] 

机构地区：[1]军械工程学院先进材料研究所,石家庄050003

出　　处：《航空材料学报》2017年第5期29-34,共6页Journal of Aeronautical Materials

摘　　要：通过溶胶凝胶法制备钙钛矿结构的La_(1-x)Ba_xMnO_3(0≤x≤0.5),利用X射线衍射、四探针电阻测量仪、红外发射率测试仪、矢量网络分析仪分别研究Ba^(2+)掺杂对镧锰氧化物晶体结构、电阻率、红外发射率和微波吸收性能的影响。研究结果表明:当Ba^(2+)掺杂浓度比较低时,掺杂的元素几乎不改变镧锰氧化物的晶体结构;当掺杂浓度增加时,晶格畸变开始增大;样品红外发射率随Ba^(2+)离子掺杂浓度的增大先降低后缓慢增加,与电阻率的变化保持一致;Ba^(2+)离子可以对样品在2~18 GHz微波吸收性能进行调控,当掺杂浓度x=0.3时,样品的吸收效果最佳;在频率为10.8 GHz时,最低反射率为-32 d B;掺杂合适元素的镧锰氧化物材料有可能应用在红外/雷达兼容隐身领域。La1-xBaxMnO3（0≤x≤0.5） with perovskite-type structure as a microwave and infrared multi-functional material has been successfully prepared by sol-gel method. The effects of Ba incorporation on the stucture, electrical conductivity, infrared emissivity and microwave-absorbing properties were investigated in detail by XRD, 4-point probes resistivity measurement system,IR-2 infrared-emissivity analyzer and vector network analyzer . XRD results show that the perovskite structure of LaMnO5 is hardly changed when the doping concentration （re） of Ba^2＋ is less than or equal to 0.5 and when the doping concentration increases, the lattice distortion increases. The incorporation of Ba in LaMnOs leads to the decrease of electrical conductivity, while the infrared emissivities are decreased. Moreover, microwave-absorbing properties in the frequency range of 2-18 GHz are sensitive to Ba content. The optimal reflection loss calculated from the measured permittivity and permeability is 32 dB at 10. 8 GHz with a thickness of 2. 0 mm when the doping amount of Ba2 ＋ is 0. 3. It is possible to make Ba-doped lanthanum manganites achieve compatible camouflage capability for radar and infrared wave-band.

关 键 词：离子掺杂 电阻率 红外发射率 微波吸收性能 

分 类 号：TB3[一般工业技术—材料科学与工程]