Effects of Cd and Cd-Cu Doping on the Microstructure and Electrical Properties of NiMnCoO NTC Ceramics
The precursors of CdxNi1-xCo0.2Mn1.8O4 (x=0,0.1,0.2,0.3) and Cd0.2Cu0.1Ni0.7Co0.2Mn1.8O4 negative 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.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
G. Na and Y. D. Li, "Effects of Cd and Cd-Cu Doping on the Microstructure and Electrical Properties of NiMnCoO NTC Ceramics", Advanced Materials Research, Vols. 236-238, pp. 1632-1635, 2011