Abstract
Different amounts of K2CO3 were added to (Ba,Sr)TiO3‐based PTCR (positive temperature coefficient of resistance) ceramics to investigate their influence on the microstructural and electrical properties. Experimental results showed that the incorporation of K acted as an A‐site acceptor‐type dopant. In addition to enhancing discontinuous grain growth, the increase of K2CO3 was found to raise the room‐temperature resistivity which was dominated by grain‐boundary resistance rather than grain resistance. By adjusting to a suitable amount of donor dopant, the inherent contamination of K in raw material can be compensated to achieve a high‐quality PTC resistor.
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