한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제28권3호
  • /
  • Pages.179-188
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  • 1991
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  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지

분위기 변화에 따른 반도성 $BaTiO_3$ 전기적 특성 연구

Studies on the Electrical Properties of Semiconducting $BaTiO_3$ by Changing Sintering Atmosphere

  • 최기영 (서울대학교 무기재료공학과) ;
  • 한응학 (서울대학교 무기재료공학과) ;
  • 박순자 (서울대학교 무기재료공학과)
  • 발행 : 1991.03.01
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초록

The semiconducting BaTiO3 ceramics used in this study were sintered in the reducing atomosphere(hydrogen gas) and neutral atmosphere(nitrogen gas), then were heat-treated in air to vary defect concentrations. In this experiment, the correlations between the composition analysis and electrical characteristics of these samples were investigated. When the BaTiO3 ceramics were sintered in N2 atmosphere, it was observed that the Ba contents near the interface were lower than that of the grain center, and these samples showed superior PTCR effects. From analysis of the resistivities of grains and grain boundaries by CIRM(Complex Impedance Resonance Method), it was confirmed that the PTCR effects were caused by the resistivity of grain boundaries. And from measurement of the capacitance at each temperature, the samples sintered in N2 atmosphere show the increase of room temperature resistance and the decrease of capacitance as a result of the increase of the charge depletion layers. This phenomenon agrees well with the cation deficiencies in the analytical results.

키워드

참고문헌

  1. J. Phys. Soc. Jpn v.14 no.9 Properties of Semiconductive Barium Titanate O. Saburi
  2. Philips Res. Rep. v.5 no.6 Controlled Valency Semiconductors Verwey;Haaijman
  3. J. Phys. Soc. Jpn. v.19 no.2 I. Ueda
  4. Ceram Patent, 929, 350 P.W. Haayman
  5. J. Am. Cer. Soc. v.46 no.48 Electrical Conduction Anomaly in Samarium-Doped Barium Titanate G. Goodman
  6. Solid State Electron. v.3 no.50 Barium Titanate als Sperrschichthalbeiter W. Heywang
  7. J. Am. Cer. Soc. v.47 no.10 Resistivity Anomaly in Doped Barium Titanate W. Heywang
  8. 연세대학교 박사학위 논문 반도성 BaTiO₃세라믹스의 저운소결과 전기적 성질 및 복합 임피던스의 공진법에 의한 계면해석 윤상옥
  9. Am. Cer. Soc. Bull. v.50 no.8 M. Kahn
  10. J. Am. Cer. Soc. v.68 no.7 Solubility of BaO in BaTiO₃ Y.H. Hu;D.M. Smyth
  11. Philips Res. Rep. v.31 Electrical Conductivity at High Temp. of Donor-Doped Barium Titanate Ceramics J. Daniels;K.H. Hardtl
  12. Philips Res. Rep. v.31 J. Daniels(et al.)
  13. Advances in Cer. v.1 Equilibrium Barriers in PTC Thermistors G. H. Jonker
  14. Solid State Electron. v.7 Some Aspects of Semiconducting Barium Titanate G.H. Jonker
  15. The Principles of Eng. Mat. C.R. Barrett(et al.)
  16. Philips Res. Rep. v.31 The Kinetice of Equilibrium Restoration in Barium Titanate Ceramics R. Wernicke