수열합성법에 의한 반도성 나노 (Ba 1-x Sb x )TiO 3 분말제조 및 PTCR 특성평가

최용각; 이종현; 이혁희; 원창환; Y.K. Choi; J.H. Lee; H.H. Lee; C.W. Won

Korean Journal of Materials Research, Vol.12, No.3, 169-175, March, 2002

DOI10.3740/MRSK.2002.12.3.169 Export Citation

수열합성법에 의한 반도성 나노 (Ba 1-x Sb x )TiO 3 분말제조 및 PTCR 특성평가

Preparation and PTCR Characteristics of Semiconductive Nano (Ba 1-x Sb x )TiO 3 Ceramic PowderS by Hydrothermal Process

최용각^†, 이종현¹, 이혁희², 원창환

충남대학교 금속공학과
¹충남대학교 급속응고 신소재 연구소
²한국 화학 연구원

Y.K. Choi^†, J.H. Lee¹, H.H. Lee², and C.W. Won

Dept. of Metallurgical Eng., Chungnam National University, Daejeon 305-764, Korea
¹Rapidly Solidified Advanced Materials Research Center, Chungnam National University, Daejeon 305-764, Korea
²Korea research Institute of Chemical Technology, Daejeon 305-600, Korea

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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 ? 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 ? 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.

Keywords:Semiconductive (Ba 1?x Sb x )TiO 3;Hydrothermal process;PTCR effects

[References]

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[1] Choi JK, Kim PC, J. Kor. Assoc. Cryst. Growth., 8(1), 49 (1998)

[2] Lee JH, Sung HK, Won CW, Kim HS, J. Kor. Inst. Met. Mater., 30(7), 768 (1992)

[3] Kim HS, Choi GJ, Lee SK, Kim YD, Sim SJ, Woo KJ, Kim KL, Cho YS, J. Kor. Ceram. Soc., 36(4), 343 (1999)

[4] Kim JS, Lee BH, Lee KH, J. Kor. Ceram. Soc., 31(2), 185 (1994)

[5] Yoon KH, Oh KY, J. Kor. Ceram. Soc., 22(3), 15 (1985)

[6] Chan NH, Smith DM, J. Am. Ceram. Soc., 67(4), 285 (1984)

[7] Yoon KH, Oh KY, Yoon SO, Mat. Res. Bull., 21(12), 1429 (1986)

[8] Heywang W, J. Mater. Sci., 6, 1214 (1977)

[9] Swilam MN, Gudalla AM, Trans. J. Brit. Ceram. Soc., 75(5), 165 (1975)

[10] Chan HM, Harmer MP, Smith DM, J. Am. Ceram. Soc., 69(6), 507 (1986)

[11] Kuwabara M, J. Am. Ceram. Soc., 64(11), 639 (1981)

[12] Ueoka H, Yodogawa M, IEEE, MFT-3(2), 77 (1974)

[13] Kato Y, Takeo M, Liang R, Kuwabara M, J. Jap. Ceram. Soc., 97(10), 1239 (1989)