Infrared Emissivities and Microwave Absorption Properties of Perovskite La1-xCaxMnO3 (0<x<0.5)
La1-xCaxMnO3 (0<x<0.5) with perovskite-type structure has been successfully prepared by sol-gel method as a microwave and infrared multi-functional material.The effects of Ca 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 LaMnO3 is hardly changed when the doping concentration (x) of Ca2+ is less than or equal to 0.5.The incorporation of Ca in LaMnO3 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 Ca content.The optimal reflection loss calculated from the measured permittivity and permeability is 42 dB at 10.5 GHz with a thickness of 2.0 mm when the doping amount of Ca2+ is 0.1.It is possible to make Ca-doped lanthanum manganites achieve compatible camouflage capability for radar and infrared wave-band.
Iron incorporation Electrical conductivity Infrared emissivity Microwave absorbing
Jia Wei Liu Jian Jiang Wang Hai Tao Gao
Advanced Material Institute, Ordnance Engineering College, Shijiazhuang 050003, China
国际会议
银川
英文
96-101
2017-08-16（万方平台首次上网日期，不代表论文的发表时间）