| La-doped $BaTiO_3$ 세라믹스에서 PTCR 특성에 미치는 Mn의 영향 |
| 김성희, 이준형, 조상희 |
| 경북대학교 무기재료공학과 |
| The Role of Mn on the PTCR Characteristics of La-doped $BaTiO_3$ Ceramics |
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| ABSTRACT |
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The role of Mn on the PTCR characteristics of La-doped BaTiO3 ceramics was studied. The calculated Ns value was increased with Mn concentration and consequently pmax and pmin were increased. The behavior of pmin was explained by the Jonker's theory, and Ns value of 6.35×1017m-2 was well agreed with the theoretical estimate of Jonker's. The value state of Mn was measured by ESR, and changed around Tc from ＋3 in tetragonal phase to ＋2 in cubic phase. Therefore, the amount of electron trap increased at Tc led to the great improvement of PTC R characteristics. |
| Key words:
BaTiO3, PTCR, Mn acceptor, ESR |
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