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Three-Dimensional Network ZnO/BaFe12O19 Composite Thick Films and their Microwave Absorption Properties
Y. Lin, J. Dong, Y. Liu, N. Han, L. Wang, H. Yang, J. Wang
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China
received December 12, 2017, received in revised form February 2, 2018, accepted March 4, 2018
Vol. 9, No. 2, Pages 183-192 DOI: 10.4416/JCST2017-00097
Abstract
ZnO/BaFe12O19 composite thick films with four different ZnO/BaFe12O19 mass fractions were synthesized with the tape-casting method in the presence of plate-like BaFe12O19 grains and sphere-like ZnO grains. Their phase composition, morphology and magnetic properties were analyzed by means of XRD, SEM and VSM, respectively. The microwave absorption properties were also investigated in the frequency range of 2 – 18 GHz, and the results show that the ZnO/BaFe12O19 composite thick films have multiple microwave attenuation peaks and their microwave absorption properties can be easily tuned by varying the mass ratio of BaFe12O19/ZnO. When the mass ratio of BaFe12O19 to ZnO is 15:85, the composite thick film exhibits a minimum RL of -48.6 dB at 17.2 GHz with a thickness of 4.5 mm. The electromagnetic performance of the ZnO/BaFe12O19 composite thick films could be attributed to the effective complementarities between the dielectric loss and the magnetic loss.
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Keywords
Tape casting, impedance matching, microwave absorption
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