Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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PTCR Properties of $BaTiO_3$ Ceramic Variation of Dopant

불순물 첨가에 따른 $BaTiO_3$ 세라믹스의 PTCR 특성

  • Published : 2004.11.11
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Abstract

PTC Thermistors specimens were fabricated by added $MnO_2$ as donors, and $Nb_2O_5$ as accepters and sintered $1250^{\circ}C/2hrs$. Average grain size decreased with increased in added $MnO_2$, and increased with added in $Nb_2O_5$. But, appeared liquid phase as $BaTiO_3$ and $TiO_2$, affect to grain growth. XRD result, peak strength waslowed then crystallization not well, but, secondary phase were not showed all specimens. All specimens resistance were so high, about $40M{\Omega}$ over, couldn't measured to those resistance and doesn't appear PTCR effect.

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