Abstract
Nickel (Ni)/epoxy composites with different Ni filler additions were prepared, and the dynamic dielectric properties of the composites were investigated using broadband dielectric spectroscopy spectrometer with the frequency range 1–107 Hz at the temperature of −20 to 200 °C. The dielectric properties as a function of temperature and frequency show three relaxation processes: (1) Maxwell interfacial polarization at low frequencies; (2) a primary α-relaxation process at near glass transition temperature (Tg); and (3) ionic conduction relaxation at the middle frequencies between 100 °C and 200 °C. Detailed studies of modulus spectrum suggest non-Debye type of relaxation mechanism for the composites. The Cole-Cole plots exhibit the contribution of filler concentration effect in the modulus characteristics of the Ni/epoxy composites. Alternating current (AC) conductivity and electric modulus studies support the hopping type of conduction in the composites, and frequency dependent AC conductivity data obey Jonscher’s power law.
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