Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of $MnO_2$ Addition on the MIcrostructure and PTCR Characteristics in Semiconducting $BaTiO_3$ Ceramics

반도성 $BaTiO_3$ 세라믹스의 미세구조 및 PTCR 특성에 미치는 $MnO_2$ 첨가 효과

  • 김준수 (한국에너지기술연구소 에너지재료연구팀) ;
  • 김홍수 (한국에너지기술연구소 에너지재료연구팀) ;
  • 백남석 (명지대학교 공과대학 무기재료공학과) ;
  • 이병하 (명지대학교 공과대학 무기재료공학과)
  • Published : 1995.05.01
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Abstract

The effect of MnO2 addition to 0.1mol% Sb2O3-doped BaTiO3 ceramics on microstructure and PTCR characteristics was studied. The PTCR characteristics was observed when 0.01 and 0.02 wt% MnO2 were added and sintered at 132$0^{\circ}C$ for 1 hour. The characteristics can be explained by the changes in the number and size of the abnormal grain growth due to the liquid phase during sintering. when the amount of MnO2 addition was 0.03 wt%, the sample showed NTCR characteristics with room-temperature resistivity over 109 Ωm regardless of the sintering temperature. This behavior can be described by the microstructure change due to the abnormal grain growth and charge compensation effect by MnO2 added. The room-temperature resistivity was increased as the amount of MnO2 was increased. And the specific resistivity ratio (pmax/pmin) showed maximum at 0.02wt% MnO2.

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References

  1. German Patent v.929 no.350 Verfahren zur Herstellung Materatials P.W. Haayman;R.D. Dam;H.A. Klasen
  2. Philps Res. Rep. v.5 Controlled-Valency Semiconductor E.J.W. Verwey;P.W. Haaijman;F.C. Romeljin;G.W. van Oosterhout
  3. Electronics Applications v.26 Properities and Applications of PTC Thermistors E. Andrich
  4. エレクトロニク セラミクス v.3 no.11 BaTiO₃ 半導體の動向 古畑芳男
  5. エレクトロニク セラミクス v.8 no.49 PTCサ-ミスタの新しい應用 二木久夫
  6. エレクトロニク セラミクス v.9 no.50 PTCサ-ミスタの新しい應用(2) 二木久夫
  7. エレクトロニク セラ ミクス v.10 no.54 家庭用電氣製品に於けゐPTC ヒ-タ-の應用 百瀉輝
  8. JSAE Review Development of PTC Element H. Niwa;T. Nagowa;M. Hori;N. Miwa
  9. エレクトロニク セラミクス v.19 no.93 BaTiO₃系 半導體の現況 西井基
  10. エレクトロニク セラミクス v.19 no.93 自動車用 PTC ヒ-タ 黃水正美;良昭夫;堀誠
  11. Energy R&D v.12 no.1 PTC Heater for Domestic Electric Product J.S. Kim;H.S. Kim;H.S. Jeon
  12. Energy R&D v.13 no.3 PTC Heater for Automotive J.S. Kim;H.S. Kim;J.H. Yang;H.S. Jeon
  13. J. Am. Ceram. Soc. v.43 no.3 Processing of Positive Temperature Coefficient Thermistor H.A. Sauer;J.R. Fisher
  14. J. Am. Ceram. Soc. v.50 no.8 Effect of Heat-Treatment on the PTCR Anomaly in Semiconducting Barium Titanate M. Kahn
  15. J. Am. Ceram. Soc. v.55 no.2 PTCR Behavior of BaTiO₃ with Nb₂O₃ and MnO₂ Additives T. Matsuoka;Y. Matsuo;S. Hayakawa
  16. Yogyo-Kyokai-Shi v.90 no.8 Some Factors Affecting the Magnitude of the PTCR Effect in Semiconducting Barium Titanate M. Kuwabara
  17. 特許公報 昭 41-121 v.46 上岡久芳;梅谷和正
  18. 特許公報 昭 42-3855 上岡久芳;梅谷和正
  19. Z. Angrew Phys. v.23 Zur Frage der Oberflachenterme in Ba-TiO₃-Kaltleitern H. Brauer
  20. J. Mat. Sci. v.6 Semiconducting Barium Titanate W. Heywang
  21. Ferroelectric Semiconductor Festkoer-perproblemes v.6 W. Heywang
  22. National Tech. Rep v.18 no.4 A Semiconducting BaTiO₃ Ceramic Doped with Nb and Mn Ions and Its Application N. Hirose;T. Matsuoka;T. Matsuo;S. Hayakawa;K. Ishikawa;K. Nagano;M. Miyamoto;H. Mifune
  23. J. Kor. Ceram. Soc. v.31 no.2 Effect of Sb₂O₃ Addition on the Microstructure and the PTCR Chracteristics in BaTiO₃ Ceramic J.S. Kim;B.H. Lee;K.H. Lee
  24. Phys. Stat. Sol(a) v.47 The Influence of Kinetic Processes on the Electrical Conductvity of Donor-Doped BaT₁O₃ Ceramics R. Wernicke
  25. Philips Tech. Rep. v.38 no.3 The PTC Effect of Barium Titanate J. Daniels;K.H. Hardtl;R. Wernicke
  26. IEEE v.MFT-3 no.2 Ceramic Manufacturing Technology for the High Performance PTC Thermistor H. Ueoka;M. Yodogawa
  27. J. Am. Ceram. Soc. v.38 no.3 Phase Equilibria in the System BaO-TiO₂ D.E. Rose;R. Roy
  28. Phts. Stat. Sol. v.35 Conducting and Insulating Incorporation of Antimony into the BaTiO₃ Lattice H. Schmelz
  29. National Tech. Rep. v.21 no.3 Behavior of Mn Ion and Grain Boundary in BaTiO₃ PTCR Semiconductor T. Matsuoka;M. Fujimura;Y. Matuo;S. Hayakawa
  30. Adavance in Ceramics v.1 Equilibrium Barriers in PTC Thermistors G.H. Jonker
  31. Adavance in Ceramics v.1 Mn-Doped BaTiO₃ S.B. Desu;E.C. Subbrarao