삼성분계 Potassium-beta-Alumina의 상관계에 안정화제(MgO/Li2O)가 미치는 영향

김우성; 임성기; Woo Sung Kim; Sung Ki Lim

Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.3, 312-317, May, 2001

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삼성분계 Potassium-beta-Alumina의 상관계에 안정화제(MgO/Li2O)가 미치는 영향

Effect of Stabilizers (MgO/Li2O) on Phase Relations of the Ternary K(+)-β/β”-Al2O3 System

김우성 ^†, 임성기

건국대학교 신소재공학과, 서울 143-701

Woo Sung Kim^†, and Sung Ki Lim

Department of Materials Chemistry and Engineering, Konkuk University, Seoul 143-701, Korea

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초록

삼성분계 K2O-MgO/Li2O-Al2O3로부터 고상반응법에 의하여 K(+)-β/β” -Al2O3를 직접 합성하였고, 이때 안정화제(MgO/Li2O)가 상관계에 미치는 영향을 조사하였다. 합성조건으로는 Al2O3와 K2O의 조성비, 하소온도 및 시간, 그리고 안정화제의 양을 변수로 하였다. K(+)-β-Al2O3상에 비하여 상대적으로 높은 이온전도도를 갖는 K(+)-β” -Al2O3상의 형성을 위하여는 동일한 합성조건하에서 Li2O가 MgO에 비하여 유리하게 작용하였다. 4.2 wt%의 MgO를 안정화제로 사용하였을 경우, K1.67Mg0.67Al10.33O17의 조성에서 1300 ℃로 5 h 합성하였을 때 β” -Al2O3상이 34%로 최대값을 나타내었고, 반면에 0.2 wt%의 Li2O를 안정화제로 사용하였을 경우, K1.68Li0.08Al10.4O16.48의 조성에서 1300 ℃로 2 h 합성하였을 때 47.9%로 최대값을 나타내었다.

K(+)-β/β”-Al2O3 in a ternary system, K2O-MgO/Li2O-Al2O3 was directly by solid state reaction, and the effect of stabilizers(MgO/Li2O) on phase relations was investigated. The condition of synthesis was changed with process parameters of composition : calcining temperature, time, and amount of stabilizers. Under the same condition of synthesis, Li2O was more favorable than MgO to form the K(+)-β”-Al2O3 since it has the higher ion-conductivity than K(+)-β-Al2O3. After the synthesis at. 1300 ℃ for 5 h using 4.2 wt% MgO for to the composition of K1.67Mg0.67Al10.33O17. the maximum value of β”-Al2O3 phase fraction obtained was 34%. In the case of Li2O, however the maximum value of β”-Al2O3 phase fraction was 47.9% from the composition of K1.68Li0.08Al10.4O16.48(corresponding to 0.2 wt% Li2O) at 1300 ℃ for 2 h.

Keywords:K2O-Li2O-Al2O3 ternary system;K-beta-alumina;ion conductor;solid electrolyte;solid oxide fuel cell

[References]

de Kroon AP, Schaefer GW, Aldinger F, Chem. Mater., 7, 878 (1995)
Farrington GC, Briant JL, Proc. Intern. Con. Fast Ion Transport in Solids Electrodes and Electrolytes, Lake Geneva, Wisconsin, 395 (1979)
Schaefer GW, Weppner W, Solid State Ion., 53, 559 (1992)
Kim KH, Ph.M. Dissertation, Yeonsei Univ., Seoul, Korea (1992)
de Kroon AP, Schaefer GW, Aldinger F, Chem. Mater., 7, 878 (1995)
Ham CH, Lim SK, Lee CK, Yoo SE, J. Korean Ind. Eng. Chem., 10(7), 1086 (1999)
Jayaraman V, Periaswami G, Kutty TRN, J. Mater. Chem., 8, 1087 (1998)
Park JH, Kim KH, Lim SK, J. Mater. Sci., 33(23), 5671 (1998)
Bettman M, Terner LL, Inorg. Chem., 10, 1442 (1971)
Youngblood GE, Miller GR, Gordon RS, J. Am. Ceram. Soc., 61, 86 (1978)
Zuxiang L, Kungang C, "Microstructure and Properties of Ceramic Materials," 391, Science Press (1984)
Song HI, Kim ES, Physica B, 150, 148 (1985)
Stevens R, Binner JGP, J. Mater. Sci., 19, 706 (1984)
Mark TCW, Zhou GD, "Crystallography in Modern Chemistry," 115, Wiley-Interscience Pub., New York (1992)

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[1] de Kroon AP, Schaefer GW, Aldinger F, Chem. Mater., 7, 878 (1995)

[2] Farrington GC, Briant JL, Proc. Intern. Con. Fast Ion Transport in Solids Electrodes and Electrolytes, Lake Geneva, Wisconsin, 395 (1979)

[3] Schaefer GW, Weppner W, Solid State Ion., 53, 559 (1992)

[4] Kim KH, Ph.M. Dissertation, Yeonsei Univ., Seoul, Korea (1992)

[5] de Kroon AP, Schaefer GW, Aldinger F, Chem. Mater., 7, 878 (1995)

[6] Ham CH, Lim SK, Lee CK, Yoo SE, J. Korean Ind. Eng. Chem., 10(7), 1086 (1999)

[7] Jayaraman V, Periaswami G, Kutty TRN, J. Mater. Chem., 8, 1087 (1998)

[8] Park JH, Kim KH, Lim SK, J. Mater. Sci., 33(23), 5671 (1998)

[9] Bettman M, Terner LL, Inorg. Chem., 10, 1442 (1971)

[10] Youngblood GE, Miller GR, Gordon RS, J. Am. Ceram. Soc., 61, 86 (1978)

[11] Zuxiang L, Kungang C, "Microstructure and Properties of Ceramic Materials," 391, Science Press (1984)

[12] Song HI, Kim ES, Physica B, 150, 148 (1985)

[13] Stevens R, Binner JGP, J. Mater. Sci., 19, 706 (1984)

[14] Mark TCW, Zhou GD, "Crystallography in Modern Chemistry," 115, Wiley-Interscience Pub., New York (1992)