ac hopping admittance in spinel manganate negative temperature coefficient thermistor electroceramics

Abstract

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.

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Item Type:	Article
Authors/Creators:	Schmidt, R. Brinkman, A.W.
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.
Dates:	Published: June 2008
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
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:4076

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ac hopping admittance in spinel manganate negative temperature coefficient thermistor electroceramics

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