Preparation and characterization of Mn 1.2 Co 0.6 Ni 1.2 O 4 NTC ceramic materials by rheological phase reaction method

Mn 1.2 Co 0.6 Ni 1.2 O 4 negative temperature coefficient thermistor materials were prepared by the rheological phase reaction method. The effect of sintering temperature on the microstructure and electrical properties of Mn 1.2 Co 0.6 Ni 1.2 O 4 ceramic materials was systemically investigated and characterized by XRD, SEM, and electrical measurement. The results indicate that all the ceramic materials show the single cubic spinel phase, as well as the material constant B values and ρ 25 of the Mn 1.2 Co 0.6 Ni 1.2 O 4 thermistors are in the range of 3199–3343 K, 593–1299 Ω cm, respectively, as the sintering temperature increases from 1100 to 1250 °C. At the sintering temperature of 1200 °C, the ceramic samples have the best thermal stability, that is the lowest resistivity drift rate (ΔR/R) of 0.43 %. Therefore, Mn 1.2 Co 0.6 Ni 1.2 O 4 ceramic materials prepared by the rheological phase reaction method meet the demands of market development and have potential in the industrial applications.