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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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.
| 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. |
| 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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