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 LaMnO3 is hardly changed when the doping concentration (x) of Ba2+ is less than or equal to 0.5 and when the doping concentration increases, the lattice distortion increases. The incorporation of Ba 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 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.
Infrared Emissivities and Microwave Absorption Properties of Perovskite La1-xBaxMnO3(0 ≤x ≤0.5)
2017
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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