Abstract
Ni–Mn–Co–(Fe) oxide thick films were coated on an alumina substrate by a screen-printing technique. The electrical properties of the thick films, as a function of composition and sintering temperature, were investigated. All the thick-film negative temperature coefficient (NTC) thermistors prepared showed a linear relationship between log resistivity and the reciprocal of the absolute temperature, indicative of NTC characteristics. As the amount of Mn3O4 in (Ni2−x Mn x Co1.0)O4 (0.6≤x≤1.8) thermistors increased, the resistivity and the coefficient of temperature sensitivity decreased to a minimum value and then increased again. Also, at a given Ni–Mn oxide content, the resistivity and the coefficient of temperature sensitivity for (Ni1.0Mn1.0Co1−x Fe x )O4 (0.25≤x≤1.0) and (Ni0.75Mn1.25Co1−x Fe x )O4 (0.25≤x≤0.75) thermistors increased with increasing Fe2O3 content. The influence of composition and sintering temperature on the electrical properties of the thermistors is discussed.
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