Doping Calcia and Yttria into Zirconia Obtained from by Product of Tin Concentrator to Improve its Ionic Conductivity
DOI:
https://doi.org/10.5614/itbj.sci.2011.43.1.2Abstract
Zirconia has been prepared from Zircon concentrate by caustic fusion methods. Zircon is a by product from tin ore concentration plant at Bangka island of Indonesia. Yttria Stabilized-Zirconia (YSZ) was prepared by introducing the 8 % mol yttrium oxide into zirconia and sintered at 1500 "?aC for 5 hours. In order to obtain constant oxygen vacancy of 8 % mol in Zirconia, an appropriate amount of Yttria and Calcia were introduced into Zirconia and the mixtures were heated at 1350 oC for 5 hours. Elemental composition was determined by SEM/EDX and XRF and lattice parameters were determined using X-ray diffraction method. Ionic conductivity was measured by complex impedance spectroscopy. The results show that doping of Yttria into Zirconia (YSZ) and Calcia-Yttria into Zirconia (CYZ) allows phase transformation of Zirconia from tetragonal with space group P42/nmc into cubic Fm3m and enhance the ionic conductivity. However, the prepared materials are porous and have not met the requirement for the electrolyte material yet.References
Xu, D., Liu, X., Wang, D., Yi, G., Gao, Y., & Zhang, D., Fabrication and Characterization of SDC-LSGM Composite Electrolytes Material in IT-SOFC., J. of Alloys and Compounds, 429, pp. 292-295, 2007.
Corman, G.S., & Stubican, V.S., Phase Equilibria and Ionic Conductivity in the System ZrO2-Yb2O3-Y2O3, Journal of American Ceramic Society, 68, pp. 174-181, 1985.
Chiba, R., Ishii, T., & Yoshimura, F., Temperature Dependence of Ionic Conductivity in (1-x) ZrO2-(x-y)Sc2O3-y Yb2O3 Electrolyte Material, Solid State Ionics, 91, pp. 249-256, 1996.
Kaneko, H, Jin, F., & Taimatsu, H., Electrical Conductivity of Zirconia Stabilized with Scandia and Yttria, Journal of American Ceramic Society, 76, pp. 793-1975, 1993.
Li, Y., Tang, Z.L., Zhang, Z.T., & Gong, J.H., Electrical Conductivity of Zirconia Stabilized with Yttria and Calcia, Journal of Material Science Letter, 18, pp. 443-444, 1999.
Gong,J.H., Li, Y., Tang, Z.L., & Zhang, Z.T., Ionic Conductivity in the Ternary System (ZrO2)1-0.08x-0.12y-(Y2O3)0.08x-(CaO)0.12y., Journal of Material Science, 35, pp. 3547-3551,2000.
Li, Y., Gong, J., Xie,Y.S., Tang, Z.L., & Zhang, Z.T., Microstructural Dependence of Electrical Conductivity of (ZrO2)0.90-(Y2O3)0.04-(CaO)0.06 Solid Electrolyte, Material Science and Engineering B, 78, pp. 140-144, 2000.
Gong, J., Li, Y., Tang, Z., Xie, Y., & Zhang, Z., Temperature-Dependence of the Lattice Conductivity of Mixed Calcia/Yttria-Stabilized Zirconia, Material Chemistry and Physic, 76, pp. 212-216, 2002.
Bucko, M.M., Ionic Conductivity of CaO-Y2O3-ZrO2 Materials with Constant Oxygen Vacancy Concentration, Journal of the European Ceramic Society, 24, pp. 1305-1308, 2004.
Scott, H.G., Phase Relationship in the Zirconia-Yttria System, Journal of Material Science, 10, pp. 1527-1535, 1975.
Soepriyanto, S., & Hidayat,T., Synthesis on Nanocrystalline Zirconia from by Product of Tin Processing in Proceeding International Conference on Mathematics and Natural Sciences (ICMNS), Faculty of Mathematics and Natural Sciences, Institute Teknologi Bandung, pp. 460-464, 2006.
Martin, P, Lopez, M.L., Pico, C., & Veiga, M.L., Li(4-x)/3Ti(5-2x)/3CrxO4(0.x.0.9) Spinels: New Negatives for Lithium Batteries, Solid State Sciences, 9, pp. 521-526, 2007.
Barsoukov, E., & Macdonald, J.R., Impedance Spectroscopy: Theory, Experiment and Applications, 2nd ed., A John Wiley & Sons, Inc., pp. 492-493, 2005.
Agrawal, R.C., & Gupta, R.K., Review Superionic Solids: Composite Electrolyte Phase- an Overview, Journal of Material Science 34, pp. 1131-1162, 1999.
Bucko, M.M., Some Structural Aspects Ionic Conductivity in Zirconia Stabilized by Yttria and Calcia, Materials Science-Poland, 24, pp. 39-44. 2006.
Bonanos, N., Slotwinski, R.K., Steele, B.C.H., & Butler, E.P., High Ionic Conductivity in Polycrystalline Tetragonal Y2O3-ZrO2, Journal of Material Science Letters, 3, pp. 245-248, 1984.
Gong, J.H., Li, Y., Tang, Z.L., Xie, Y.S., & Zhang, Z.T., Temperature-Dependence of The Lattice Conductivity of Mixed Calcia/Yttria-Stabilized Zirconia, Material Chemistry and Physics, 76, pp. 212-216, 2002.
Li, Y., Liu, M., Gong, J., Chen, Y., Tang, Z., & Zhang, Z., Grain Boundary Effect in Zirconia Stabilized with Yttria and Calcia by Electrical Measurements, Material Science and Engineering B, 103, pp. 108-114, 2003.