Controlled thermistor effect in the system CuxNi1-x-yCo2yMn2-yO4

M. Vakiv, O. Shpotyuk, O. Mrooz, I. Hadzaman.

Journal of the European Ceramic Society, vol. 21, 2001, p. 1783–1785.


The problem of selection guidelines for oxide semiconducting ceramics with controlled thermistor effect, prepared on the basis of complex CuxNi1-x-yCo2yMn2-yO4 (0.1≤x≤0.8; 0.1≤y≤0.9–x) chemical system and restricted by CuMn2O4, MnCo2O4 and NiMn2O4 spinel-structured compounds, is discussed. It is shown that the developed ceramic thermistors with a wide range of predetermined exploitation parameters (rated resistance from 2 to 21,500 Ω, material-specific constant B of NTC thermistor from 2435 to 3365 K), as well as a high level of reliability can be obtained using the proper methods of technological, compositional and design modifications. The attempt to establish a general relationships between chemical composition, technological features of sintering and electrical properties for single-phase ceramics is made, using the method of simplex matrices of the 4-fold D-optimum plan.


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