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ac hopping admittance in spinel manganate negative temperature coefficient thermistor electroceramics

Schmidt, R. and Brinkman, A.W. (2008) ac hopping admittance in spinel manganate negative temperature coefficient thermistor electroceramics. Journal of Applied Physics, 103 (11). p. 113710.


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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 vs and (/dc) vs , and specific impedance z vs −z/ and [(dc/z)−1] vs , in order to characterize GB charge transport. Using the complex admittance notation (*), an unusually low Jonscher exponent of frequency ~0.007 was obtained and the GB relaxation displayed close to ideal behavior.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008 Amer Inst Physics. This is an author produced version of a paper published in Journal of Applied Physics. Uploaded in accordance with the publisher's self archiving policy.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 17 Jul 2008 14:47
Last Modified: 08 Feb 2013 16:56
Published Version: http://dx.doi.org/10.1063/1.2938029
Status: Published
Publisher: American Institute Physics
Refereed: Yes
Identification Number: 10.1063/1.2938029
URI: http://eprints.whiterose.ac.uk/id/eprint/4076

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