DIELECTRIC BEHAVIOUR OF MAGNETIC NICKEL NANOPARTICLES ENCAPSULATED IN SILICA
DOI:
https://doi.org/10.58260/j.nras.2202.0104Keywords:
Nickel, Oxidation, Thermal properties, Silica, Metal-insulator transitions, Electrical measurementsAbstract
The impedance measurement showed activation energy of 1.3 eV and decrease in dc conductivity with temperature. The high dielectric constant over a wide frequency range is explained as a consequence of concentration of Ni much higher than the percolation threshold. The conductivity mechanism is dominated by tunneling at low frequency and electron hopping at high frequencies. The material suffers a low loss in high frequency range, making it suitable for high frequency magnetic applications.
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