Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of Yttria and Calcia Co-Doping on the Electrical Conductivity of Zirconia Ceramics

  • Lee, Jong-Sook (School of Materials Science and Engineering, Chonnam National University) ;
  • Shin, Dong-Kyu (School of Materials Science and Engineering, Chonnam National University) ;
  • Choi, Byung-Yun (School of Materials Science and Engineering, Chonnam National University) ;
  • Jeon, Jung-Kwang (School of Materials Science and Engineering, Chonnam National University) ;
  • Jin, Sung-Hwan (School of Materials Science and Engineering, Chonnam National University) ;
  • Jung, Kwon-Hee (School of Materials Science and Engineering, Chonnam National University) ;
  • An, Pyung-An (School of Materials Science and Engineering, Chonnam National University) ;
  • Song, Sun-Ju (School of Materials Science and Engineering, Chonnam National University)
  • Published : 2007.12.31
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Abstract

Zirconia polycrystals co-doped with x mol% CaO and (10-x) mol% $Y_2O_3$ were prepared by solid state reaction method. The compositions were chosen for nominally the same oxygen vacancy concentration of 5 mol%. X-ray diffraction patterns indicated the formation of cubic zirconia by heat treatment at $1600^{\circ}C$. Impedance spectroscopy was applied to deconvolute the bulk and grain boundary response. Electrical conductivity was measured using the complex impedance technique from 516 to 874 K in air. Maximum conductivity was exhibited by the composition with equal amounts of CaO and $Y_2O_3$, which may be ascribed to the smaller degree of defect-interactions in that composition due to the competition of different ordering schemes between the two systems. When compared to the composition containing $Y_2O_3$ only, co-doping of CaO increases the grain boundary resistance considerably. The activation energy of grain and grain boundary conductivity was 1.1 eV and 1.2 eV, respectively, with no appreciable dependence on dopant compositions.

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References

  1. A. Bogicevic, C. Wolverton, G. M. Crosbie, and E. B. Stechel, 'Defect Ordering in Aliovalently Doped Cubic Zirconia from First Principles,' Phys. Rev. B 64 014106 (2001) https://doi.org/10.1103/PhysRevB.64.014106
  2. J. A. Kilner and R. J. Brook, 'A Study of Oxygen Ion Conductivity in Doped Non-Stoichiometric Oxides,' Solid State Ionics 6 237-52 (1982) https://doi.org/10.1016/0167-2738(82)90045-5
  3. J.-S. Lee, M. Lerch, and J. Maier, 'Nitrogen-Doped Zirconia: A Comparison with Cation Stabilized Zirconia,' J. Solid State Chem. 179 270-77 (2006) https://doi.org/10.1016/j.jssc.2005.10.012
  4. D. W. Strickler and W. G. Carlson, 'Ionic Conductivity of Cubic Solid Solutions in the System $CaO-Y_2O_3-ZrO_2$,' J. Am. Ceram. Soc. 47 [3] 122-27 (1964) https://doi.org/10.1111/j.1151-2916.1964.tb14368.x
  5. J. Gong, Y. Li, Z. Zhang, and Z. Tang, 'Ac Impedance Study of Zirconia Doped with Yttria and Calcia,' J. Am. Ceram. Soc. 83 [3] 648-50 (2000) https://doi.org/10.1111/j.1151-2916.2000.tb01247.x
  6. M. M. Buko, 'Ionic Conductivity of $CaO-Y_2O_3-ZrO_2$ Materials with Constant Oxygen Vacancy Concentration,' J. Eur. Ceram. Soc. 24 1305-08 (2004) https://doi.org/10.1016/S0955-2219(03)00502-8
  7. H. J. Rossell, 'Crystal Structures of some Fluorite-Related $M_7O_{12}$ Compounds,' J. Solid State Chem. 19 [2] 103-11 (1976) https://doi.org/10.1016/0022-4596(76)90156-0
  8. H. J. Rossell, 'Ordering in Anion-Deficient Fluorite-Related Oxides,' pp. 47-63, in Science and Technology of Zirconia. Edited by A. H. Heuer and L. W. Hobbs. Am. Ceram. Soc., Westerville OH, 1981

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