Influence of Frequency and Temperature on the Dielectric Properties of Ni0.4Zn0.6Fe2O4-Polypropylene Composites

Foo Khoon Tan; Jumiah Hassan; Yin Hong Chong; Nurhidayaty Mokhtar; Mansor Hashim; Nor Azowa Ibrahim

doi:10.4028/www.scientific.net/AMR.545.321

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Influence of Frequency and Temperature on the Dielectric Properties of Ni_0.4Zn_0.6Fe₂O₄-Polypropylene Composites

Abstract:

Ni_0.4Zn_0.6Fe₂O₄-polypropylene (PP) composites were investigated for their dielectric property which constitutes the dielectric constant , and dielectric loss factor . Nickel zinc ferrites (NZF) were prepared via the conventional solid state method and sintered at 1250 °C for 10 hours. Ni_0.4Zn_0.6Fe₂O₄ acts as filler while PP is the matrix. 5% and 25% NZF were added into the PP and blended to form NZF-PP composites. Dielectric measurements were made from room temperature to 120 °C at 20 °C intervals using the HP 4284A Precision LCR Meter at frequencies 240 Hz to 1 MHz. is almost constant and independent of frequency and temperature below 100 KHz before decreasing showing dispersion probably due to space charge or interfacial polarization. Distinct relaxation loss peaks can be seen emerging at about 100 KHz shifting towards the higher frequency with increasing temperature. Generally, increasing the content of filler improve the dielectric strength of the composite. Thus, addition of NZF enhances the dielectric properties of NZF-PP composite.