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ElectroComponent Science and Technology
Volume 11 (1985), Issue 4, Pages 255-259
http://dx.doi.org/10.1155/APEC.11.255

On Experimental Data of the TCR of TFRs and Their Relation to Theoretical Models of Conduction Mechanism

Zentralinstitut für Festkörperphysik und Werkstofforschung der Akademie der Wissenschaften der DDR, Dresden, Germany

Received 25 May 1983; Accepted 5 October 1983

Copyright © 1985 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Any theory of electrical conduction in TFRs encounters mainly two problems: (i) explanation of the dependence of R on properties of conducting component (volume fraction, grain size, resistivity), (ii) explanation of the temperature dependence of R taking into account (i). In order to achieve this one has to fit some microscopic parameters to experimental R-and TCR-values, and to check if they are reasonable or not. The aim of the following discussion is to show, that such a fitting by means of experimental TCR-values is not correct. This is due to the fact that TCR-behaviour, as is well known, is determined also by the dependence of resistivity on strain. But any theoretical model neglects strains, also those who are induced by thermal strains. By means of published experiments concerning the strain dependence of resistance, the magnitude is estimated by which the TCR-values have to be corrected for the described fit.