DOI QR코드

DOI QR Code

Effects of Strontium Gallate Additions on Sintering Behavior and Electrical Conductivity of Ce0.8Gd0.2O2-δ Ceramics

Strontium Gallate의 첨가에 따른 Ce0.8Gd0.2O2-δ 세라믹스의 소결거동과 전기전도도 특성

  • 박진희 (부산대학교 재료공학부, 경성대학교 신소재공학과) ;
  • 최광훈 (경성대학교 신소재공학과) ;
  • 류봉기 (부산대학교 재료공학부) ;
  • 이주신 (경성대학교 신소재공학과)
  • Published : 2006.02.01

Abstract

The densification behavior and electrical conductivity of $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics were investigated with the strontium gallate concentration ranging from 0 to $5\;mol\%$. Both the sintered density and grain size were found to increase rapidly up to $0.5\;mol\%$ $Sr_2Ga_2O_5$, and then to decrease with further addition. Dense $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics with $97\%$ of the theoretical density could be obtained for $0.5\;mol\%$ $Sr_2Ga_2O_5$-added specimen sintered at $1250^{\circ}C$ for 5 h, whereas pure $Ce_{0.8}Gd_{0.2}O_{1.9}$ ceramics needed to be sintered at $1550^{\circ}C$ in order to obtain an equivalent theoretical density, Electrical conductivity was measured as a function of dopant content, over the temperature range of $350\;-\;600^{\circ}C$ in air. Total conductivity of $0.5\;mol\%$ $Sr_2Ga_2O_5$-added specimen showed the maximum conductivity of $2.37{\times}10^{-2}{{\Omega}-1}{\cdot}cm^{-1}$ at $500^{\circ}C$, The addition of strontium gallate was found to promote the sintering properties and electrical conductivities of $Gd_2O_3$-doped $CeO_2$.

References

  1. H. Inaba and H. Tagawa, 'Ceria-based solid electrolytes', Solid State lonics, Vol. 83, p. 1, 1996 https://doi.org/10.1016/0167-2738(95)00229-4
  2. J. V. Herle, T. Horita, T. Kawada, N. Sakai, H. Yokokawa, and M. Dokiya, 'Fabrication and sintering of fine yttriadoped ceria powder', J. Am. Ceram. Soc., Vol. 80, p. 933, 1997 https://doi.org/10.1111/j.1151-2916.1997.tb03083.x
  3. H. Yoshida, K. Miura, J. Fujita, and T. Inagaki, 'Effect of gallia addition on the sintering behavior of samaria-doped ceria', J. Am. Ceram. Soc., Vol. 82, p. 219, 1999 https://doi.org/10.1111/j.1151-2916.1999.tb01747.x
  4. C. M. Kleinlogel and L. J. Gauckler, 'Sintering and properties of nanosized ceria solid solutions', Solid State lonics, Vol. 135, p. 567, 2000
  5. C. M. Kleinlogel and L. J. Gauckler, 'Mixed electronic-ionic conductivity of cobalt doped cerium gadolinium oxide', J. Electroceram., Vol. 5, p. 231, 2000 https://doi.org/10.1023/A:1026583629995
  6. T. Zhang, P. Hing, H. Huang, and J. Kilner, 'Densification, microstructure and grain growth in the $CeO_2 - Fe_2O_3$ system (O$\leq$20 %)', J. Europ. Ceram. Soc., Vol. 21, p. 2221, 2001 https://doi.org/10.1016/S0955-2219(00)00342-3
  7. T. Zhang, P. Hing, H. Huang, and J. Kilner, 'Sintering and grain growth of CoO-doped $CeO_2$ ceramics', J. Europ. Ceram. Soc., Vol. 22, p. 27, 2002 https://doi.org/10.1016/S0955-2219(01)00240-0
  8. J]. S. Lee, K. H. Choi, B. K. Ryu, B. C. Shin, and I. S. Kim, 'Effects of alumina additions on sintering behavior of gadoliniadoped ceria', Ceramics International, Vol. 30, p. 807, 2004 https://doi.org/10.1016/j.ceramint.2003.07.018
  9. J. S. Lee, K. H. Choi, B. K. Ryu, B. C. Shin, and I. S. Kim, 'Effects of gallia additions on sintering behavior of gadoliniadoped ceria', Mater. Res. Bull., Vol. 39, p. 2025, 2004 https://doi.org/10.1016/j.materresbull.2004.07.022
  10. K. Keizer, A. J. Burggraaf, and G. De With, 'The effect of $Bi_2O_3$ on the electrical and mechanical properties of $ZrO_2-Y_2O_3$ ceramics', J. Mater. Sci., Vol. 17, p. 1095, 1982
  11. B. S Chiou, W. Y. Hsu, and J. G. Duh, 'Fabrication and electrical behavior of liquid phase sintered zirconia', Ceramics International, Vol. 14, p. 7, 1988
  12. M. Feng and J. B. Goodenough, 'Improving stabilized zirconia with strontium gallate', J. Am. Ceram. Soc., Vol. 77, p. 1954, 1994
  13. J. L. Shi, T. S. Yen, and H. Schubert, 'Effect of small amounts of additives on the sintering of high-purity Y-TZP', J. Mater. Sci., Vol. 32, p. 1341, 1997 https://doi.org/10.1023/A:1018516925649
  14. C. Bowen, S. Ramesh, C. Gill, and S. Lawson, 'Impedance spectroscopy of CuO-doped Y-TZP ceramics', J. Mater. Sci., Vol. 33, p. 5103, 1998 https://doi.org/10.1023/A:1004455130927
  15. C. C. Appel and N. Bonanos, 'Structural and electrical characterization of silicacontaining yttria-stabilized zirconia', J. Europ. Ceram. Soc., Vol. 19, p. 847, 1999 https://doi.org/10.1016/S0955-2219(98)00329-X
  16. T. S. Zhang, L. B. Kong, Z. Q. Zeng, H. T. Huang, P. Hing, Z. T. Xia, and J. Kilner, 'Sintering behavior and ionic conductivity of $Ce_{0.8}Gd_{0.2}O_{1.9}$ with a small amount of $MnO_2$ doping', J. Solid State Electrochem., Vol. 7, p. 348, 2003 https://doi.org/10.1007/s10008-002-0337-9
  17. V. P. Kobzareva, L. M. Kovba, L. M. Lopato, L. N. Lykova, and A. V. Shevchenko, 'Equilibrium diagram of the $SrO_2-Ga_2O_3$ system', Russ. J. Inorg. Chem., Vol. 21, p. 903, 1976
  18. J. E. Bauerle, 'Study of solid electrolyte polarization by a complex admittance method', J. Phys. Chem. Solids, Vol. 30, p. 2657, 1969
  19. J Ma, T. S. Zhang, L. B. Kong, P. Hing, and S. H. Chan, '$Ce_{0.8}Gd_{0.2}O_{2-{\delta}}$ ceramics derived from commercial subrnicron-sized $CeO_2$ and $Gd_2O_3$ powders for use as electrolytes in solid oxide fuel cells', J. Power Sources, Vol. 132, p. 71, 2004 https://doi.org/10.1016/j.jpowsour.2003.12.029
  20. Y. Ji, J. A. Kilner, and M. F. Carolan, 'Electrical conductivity and oxygen transfer in gadolinia-doped ceria (CGO)-$Co_3O_{4-{\delta}}$ composites', J. Europ. Ceram. Soc., Vol. 24, p. 3613, 2004 https://doi.org/10.1016/j.jeurceramsoc.2003.12.016