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.
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.
|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|
|Publisher:||American Institute Physics|