Aging of NTC Ceramics in the System Mn-Ni-Fe-O
Source abstract
Abstract
The aging behaviour at 150°C of negative temperature coefficient ceramics in the system Mn-Ni-Fe-O has been investigated. Comparison is made between samples cooled in air and in a controlled atmosphere in which no oxidation can occur. The results show that the aging is dependent on composition and is strongly dependent on oxidation which occurs during cooling in air after sintering of the ceramics. From these results a model has been derived which describes the aging mechanism as a migration of cationic vacancies from the grain boundaries to the bulk. Additionally, cations and cationic vacancies migrate to their thermodynamically favourable site in the spinel structure.
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Research context
OpenAlex topics: Electrical and Thermal Properties of Materials · Microwave Dielectric Ceramics Synthesis · Ferroelectric and Piezoelectric Materials
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References (33)
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