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Aging of iron manganite negative temperature coefficient thermistors

Published online by Cambridge University Press:  31 January 2011

T. Battault ,
R. Legros  and
A. Rousset
T. Battault
Affiliation:
Laboratoire de Chimie des Matériaux Inorganiques, U.R.A. C.N.R.S. 1311, Université Paul Sabatier–118, route de Narbonne, 31062 Toulouse Cedex, France
R. Legros
Affiliation:
Laboratoire de Chimie des Matériaux Inorganiques, U.R.A. C.N.R.S. 1311, Université Paul Sabatier–118, route de Narbonne, 31062 Toulouse Cedex, France
A. Rousset*
Affiliation:
Laboratoire de Chimie des Matériaux Inorganiques, U.R.A. C.N.R.S. 1311, Université Paul Sabatier–118, route de Narbonne, 31062 Toulouse Cedex, France
*
b) Author to whom correspondence should be addressed.[email protected]
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Abstract

“Aging,” defined as the drift of resistance with temperature after 1000 h, was investigated for iron manganite temperature coefficient thermistors. For these devices, aging is relatively large, about 10%. The cationic distributions before and after aging were determined by Mössbauer spectroscopy. These distributions explain all the x-ray diffraction and correlated electrical data. The origin of the aging observed on iron manganites thermistors has been identified. It is due to the migration of Fe3+ ions from tetrahedral to octahedral sites of the spinel structure in order to reach a structural equilibrium.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1238 - 1242
Copyright
Copyright © Materials Research Society 1998

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