Investigation on Polarity of TiO2 Varistor Using Impedance Spectroscopy and the Frequency Effects

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Abstract:

Current-voltage (I-V) and impedance spectroscopy are employed to investigate the polarity of TiO2 varistor. It is found that TiO2 varistor shows typical polarity behavior, i.e., the I-V curve is asymmetric, the impedance slightly increases, and the capacitance slightly decreases when the bias voltage reverses. The effects of measuring frequency on impedance spectroscopy are systematically investigated. The results indicate that TiO2 varistor behaves considerable polarity under low sweeping frequency. High sweeping frequency (over 103 Hz) counteracts the polarity behavior. A model of micro-polarized zone is tentatively proposed to clarify the polarity behavior of TiO2 varistor.

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Advanced Materials Research (Volumes 986-987)

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1942-1945

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July 2014

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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