Abstract
The effect of the composition on the microstructure and electrical properties of Ni 1.0Mn 2− x Zr x O 4 (0≤ x≤1.0) negative temperature coefficient (NTC) thermistors was studied. Major phases present in the sintered bodies of Ni 1.0Mn 2− x Zr x O 4 were the solid solutions of Ni–Mn–Zr oxides with a cubic spinel structure and the ZrO 2 with a tetragonal structure. ZrO 2 was formed by the partial decomposition or incomplete formation of the Ni–Mn–Zr oxides during sintering. The ZrO 2 phase increased with an increase in the amount of added ZrO 2. The relationship between log resistivity (log ρ) and the reciprocal of absolute temperature (1/ T) of the prepared NTC thermistors was linear, indicative of NTC characteristics. The resistivity, B constant, and activation energy of the thermistors increased with an increase of ZrO 2 content.
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