Abstract
The influence of the Fe on the microstructure, electrical and dielectric properties of Ni0.6Cu0.4FeyMn2−yO4 (0.1≤y≤0.5) negative temperature coefficient (NTC) thermistors prepared by well known simple chemical co-precipitation method were studied. The replacement of manganese by iron plays an important role in changing the lattice parameter, X-ray density, sintered density, porosity, DC resistivity at different temperatures and dielectric properties at different frequencies. The X-ray and sintered density increased linearly and porosity decreased with iron. The room temperature resistivity of nickel copper manganite NTC ceramic decreased from 1MΩcm to 68KΩcm and dielectric constant increased from ∼9×107 to 1.5×109 at 20Hz as iron content increased.
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