In this work, the ac admittance of a thick film nickel manganate spinel negative temperature coefficient thermistor ceramic system containing a glass phase is investigated. The dominating relaxation process is a grain boundary (GB) effect and has been investigated comprehensively. We present double-logarithmic plots of the specific admittance σ′ vs ω and (σ′/σdc) vs ω, and specific impedance z′ vs −z″/ω and [(ρdc/z′)−1] vs ω, in order to characterize GB charge transport. Using the complex admittance notation (σ∗), an unusually low Jonscher exponent of frequency ∼0.007 was obtained and the GB relaxation displayed close to ideal behavior.
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Schmidt et al. (2008) studied this question.
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