Effects of Cd and Cd-Cu Doping on the Microstructure and Electrical Properties of NiMnCoO NTC Ceramics

Abstract

The precursors of CdxNi1-xCo0.2Mn1.8O4(x=0,0.1,0.2,0.3) and Cd0.2Cu0.1Ni0.7Co0.2Mn1.8O4negative temperature coefficient (NTC) ceramics were prepared at room temperature by the solid reaction. These precursors were calcined and then sintered in air at 1100°C. Influence of the Cd and Cd-Cu doping on the microstructure and electrical properties of the NTC ceramics were investigated by X-ray diffraction and SEM technique. The results showed that Cd doping was conducive to reduce the grain size, increase density, and obtain high thermal stability.