Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Preparation and PTCR Characteristics of Semiconductive Nano (Ba1-xSbx)TiO3 Ceramic PowderS by Hydrothermal Process

수열합성법에 의한 반도성 나노 (Ba1-xSbx)TiO3 분말제조 및 PTCR 특성평가

  • Choe, Yong-Gak (Dept. of Metallurgical Eng., Chungnam National University) ;
  • Lee, Jong-Hyeon (Rapidly Solidified Advanced Materials Research Center, Chungnam National University) ;
  • Lee, Hyeok-Hui (Korea research Institute of Chemical Technology) ;
  • Won, Chang-Hwan (Dept. of Metallurgical Eng., Chungnam National University)
  • Published : 2002.03.01
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Abstract

Semiconductive nano $(Ba_{1-x}Sb_x)TiO_3$ powders were synthesized by the hydrothermal process and Sb was simultaneously doped in the hydrothermal condition. $(Ba_{1-x}Sb_x)TiO_3$ powders obtained from optimum condition(at 20$0^{\circ}C$ for 3hr) exhibited spherical shape, high purity and nano size. The PTCR characteristics was observed when 0.1 and 0.2 mole% Sb were added and sintered at over 130$0^{\circ}C$ for 1 hour, respectively. And The ceramics exhibit the PTCR characteristics with a resistively jump $ratio($\rho$_{max}/$\rho$_{min})$ of about $10^4$. Also we found that PTCR characteristics were dependent on the microstructure.

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References

  1. J.K. Choi and P.C. Kim, J. Kor. Assoc. Cryst. Growth., 8(1), 49 (1998)
  2. J.H. Lee, H.K. Sung, C.W. Won and H.S. Kim, J. Kor. Inst. Met. & Mater., 30(7), 768 (1992)
  3. H.S. Kim, G.J. Choi, S.K. Lee, Y.D. Kim, S.J. Sim, K.J. Woo, K.L. Kim and Y.S. Cho, J. Kor. Ceram. Soc., 36(4), 343 (1999)
  4. J.S. Kim, B.H. Lee and K.H. Lee, J. Kor. Ceram. Soc., 31(2), 185-193 (1994)
  5. K.H. Yoon and K.Y. Oh, J. Kor. Ceram. Soc., 22(3), 15 (1985)
  6. N.H. Chan and D.M. Smith, J. Am. Ceram. Soc., 67(4), 285 (1984) https://doi.org/10.1111/j.1151-2916.1984.tb18849.x
  7. K.H. Yoon, K.Y. Oh and S.O. Yoon, Mat. Res. Bull., 21(12), 1429 (1986) https://doi.org/10.1016/0025-5408(86)90082-6
  8. W. Heywang, J. mater. Sci., 6, 1214-1226 (1977) https://doi.org/10.1007/BF00550094
  9. M.N. Swilam and A.M. Gudalla, Trans. J. Brit. Ceram. Soc., 75(5), 165 (1975)
  10. H.M. Chan, M.P. Harmer and D.M. Smith, J. Am. Ceram. Soc., 69(6), 507 (1986) https://doi.org/10.1111/j.1151-2916.1986.tb07453.x
  11. M. Kuwabara, J. Am. Ceram. Soc., 64(11), 639 (1981) https://doi.org/10.1111/j.1151-2916.1981.tb15861.x
  12. H. Ueoka and M. Yodogawa, IEEE MFT-3(2), 77-82 (1974) https://doi.org/10.1109/TMFT.1974.1135679
  13. Y. Kato, M. Takeo, R. Liang and M. Kuwabara, J. Jap. Ceram. Soc., 97(10), 1239-1244 (1989) https://doi.org/10.2109/jcersj.97.1239