| La3+ doped (Ba1-x Cax) TiO3의 PTCR 특성에 미치는 첨가제의 영향 |
| 강원호, 오봉인, 김재현, 이경희1 |
삼성코닝 연구소
1명지대학교 무기재료공학과 |
| Effect of Additives on the PTCR Characteristics of La3+ Doped(Ba1-xCax)TiO4 Ceramics |
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| ABSTRACT |
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Commercially available PTCR (Postive Temperature Coefficient of Resistivity) ceramics which have low room temperature resistance, high PTC effect and temperature coefficient were prepared by La3+ doped semiconducting barium calcium titanate soild solutions. PTCR characteristics were remarkably improved by addition of AST (1/3 Al2O3$.$3/4SiO2$.$1/4TiO2) and MnCl2. That can be explained by formation of liquid phase during sintering and acceptor level on the intergranular layer. Resistivity anormaly increased with decreasing cooling rate. Optimum manufacturing conditions were cooling rate below 100$.$C/hr, Ca and Mn content of 4 mol% &, 0.09-0.12mol% respectively. |
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