Abstract
High temperature-sensitive Ni0.54Mn1.26Fe1.2O4 NTC ceramics were prepared by a conventional two-step sintering approach in the present work. The effect of sintering process on the microstructural and electrical properties of submicro NTC thermistors was investigated. The micromorphology results show increase of the first-step sintering temperature (1000–1180 °C) significantly reduced pores. The relative density and grain size of the materials are increased with the increase of the second-step sintering temperature (1000–1080 °C). The electrical properties results illustrate that thermal constant (B values) are in the range of 5210–5392 K. The complex impedance results demonstrated that both the grain boundary resistance and grain resistance showed a typical NTC characteristic, most of all, the latter illustrated more sensitive with temperature than that of the former, indicating that the grain resistance is dominant for the submicro-structured NTC ceramics.
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