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Studies of the temperature and frequency dependent impedance of an electroceramic functional oxide NTC thermistor



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Schmidt, Rainer (2007) Studies of the temperature and frequency dependent impedance of an electroceramic functional oxide NTC thermistor. Advanced functional materials, 17 (16). pp. 3170-3174. ISSN 1616-301X

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Official URL: http://dx.doi.org/10.1002/adfm.200600878


The charge transport mechanism and the macroscopic dielectric constant in polycrystalline device materials commonly exhibit several components such as electrode-sample interface, grain boundary and bulk contributions. In order to gain precise understanding of the functionality of polycrystalline electroceramic device materials it is essential to deconvolute these contributions. The paradigm of functional NTC thermistor ceramics based on thick film spinel manganates has been studied by temperature dependent alternating current impedance spectroscopy. Three typical relaxation phenomena were detected, which all showed a separated temperature dependence of resistivity consistent with thermally activated charge transport. The dominating grain boundary and the interface contributions exhibited distinctively different capacitance allowing clear identification. The composite nature of the dielectric properties in polycrystalline functional ceramics was emphasized, and impedance spectroscopy was shown to be a powerful tool to account for and model such behavior.

Item Type:Article
Additional Information:

The authors wish to thank Michael Petty for allowing use of the ac impedance spectroscopy facility. Thanks to Finlay Morrison and Ian Terry for useful discussions concerning impedance spectroscopy data analysis. Thanks to Andreas Roosen and Alfons Stiegelschmitt for the guidance provided in developing screen-printing procedures.

Uncontrolled Keywords:Chemistry, Multidisciplinary; Physical chemistry, Nanoscience, Nanotechnology, Materials Science, Applied physics, Condensed matter
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:33809
Deposited On:27 Oct 2015 17:47
Last Modified:10 Dec 2018 14:58

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