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Crystallite Size Effect on Voltage Tunable Giant Dielectric Permittivity of Nanocrystalline CuO
T. Prakash,B.S. Murty,A.R. Kaskhedikar,P.D. Peshwe 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.1
The effect of crystallite size and applied DC bias voltage on dielectric permittivity of CuO was studied using impedance spectroscopy. The measurements were performed at room temperature in a wide frequency range of 1 Hz to 1 MHz under applied DC bias voltages from 0 to 3 V in the periodic increment of 0.2 V. The observed applied DC bias voltage effect on giant dielectric constant (ε' = 104) were analyzed with ‘grain boundary double Schottky potential barrier height model’. The percentage of tunability (T %) at the frequency 100 Hz is found to be 45.5% for the case of nanocrystalline CuO in contrast to 0% tunability in bulk CuO.