Abstract
The dielectric properties of La1.9Sr0.1Ni0.6Mg0.4O4/poly(vinylidene fluoride) (LSNMO/PVDF) composites were investigated. A giant-permittivity LSNMO ceramic was used as a filler to enhance the dielectric permittivity (ε′) of a PVDF polymer. LSNMO particles were well dispersed in the PVDF matrix. ε′ and the loss tangent (tanδ) of the composites increased with increasing LSNMO volume fraction. Interestingly, a greatly enhanced ε′ ≈ 103 was obtained in the LSNMO/PVDF composite with 50 vol% LSNMO, which was ≈100 times higher than that of pure PVDF. The percolation theory, effective medium theory, and effective medium percolation theory (EMPT) models were employed to describe the dielectric behavior of the LSNMO/PVDF composites. The calculated values obtained by the EMPT model were in close agreement with the experimental values. The large increases in ε′ was described as a combination of strong interfacial polarization due to a short inter-particle distance between LSNMO particles and a high ε′ of LSNMO ceramic filler.
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Acknowledgements
This work was financially supported by the Thailand Research Fund (TRF) and Khon Kaen University (Contract No. RSA5880012) and under the TRF Senior Research Scholar (Contract No. RTA5780004). This work was partially supported by the Nanotechnology Center (NANOTEC), NSTDA, Ministry of Science and Technology, Thailand, through its program of Center of Excellence Network and the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University. K.M. would like to thank the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant No. PHD/0191/2556) for his Ph.D. scholarship.
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Meeporn, K., Thongbai, P., Maensiri, S. et al. Improved dielectric properties of PVDF composites by employing Mg-doped La1.9Sr0.1NiO4 particles as a filler. J Mater Sci: Mater Electron 28, 11762–11768 (2017). https://doi.org/10.1007/s10854-017-6981-8
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DOI: https://doi.org/10.1007/s10854-017-6981-8