Effect of grain size on electrical properties of scandia-stabilized zirconia

10 mol % Sc2O3-stabilized ZrO2 (10ScSZ) was sintered by several processes including spark plasma sintering, milliwave sintering and conventional sintering. The electrical conductivity of the sintered 10ScSZ samples was obtained by AC impedance spectra, and compared with grain size and the crystal phase. As average grain size decreased, the electrical conductivities decreased and increased at temperatures higher and lower than the phase transition point, respectively. These trends suggested that the fraction of a low conductivity rhombohedral phase increases with increasing grain size at a temperature lower than the phase transition point, and that the total thickness of the grain boundary affects the electrical conductivity at a temperature higher than the phase transition point.

[1]  Y. Sakka,et al.  Bulk Ti1−xAlxN nanocomposite via spark plasma sintering of nanostructured Ti1−xAlxN–AlN powders , 2009 .

[2]  Y. Sakka,et al.  Electric current activated/assisted sintering (ECAS): a review of patents 1906–2008 , 2009, Science and technology of advanced materials.

[3]  A. Kishimoto,et al.  Millimeter wave sintering of AIN ceramics with high thermal conductivity , 2009 .

[4]  Y. Sakka,et al.  Effect of bead-milling treatment on the dispersion of tetragonal zirconia nanopowder and improvements of two-step sintering , 2009 .

[5]  Antonio Mario Locci,et al.  Consolidation/synthesis of materials by electric current activated/assisted sintering , 2009 .

[6]  Z. A. Munir,et al.  Turbostratic boron nitride consolidated by SPS , 2009 .

[7]  N. Enomoto,et al.  Evaluation on microstructure and dissolution behavior of SiC-AlN composites fabricated by SPS process , 2008 .

[8]  T. Goto,et al.  Densification and microstructure of Al2O3-cBN composites prepared by spark plasma sintering , 2008 .

[9]  N. Matsunaga,et al.  Grain size dependence of electrical properties of Gd-doped ceria , 2008 .

[10]  A. Kara,et al.  Spark plasma sintering of Si3N4-B4C composites , 2008 .

[11]  S. Itoh,et al.  Application of 28 GHz Microwave Irradiation to Oxidation of Ilmenite Ore for New Rutile Extraction Process , 2007 .

[12]  K. Wallwork,et al.  Structural Principles for Anion-Deficient, Fluorite-Related Superstructures in the Zirconia-Scandia SystemDedicated to Professor Joachim Strähle on the Occasion of his 65thBirthday , 2002 .

[13]  Y. Takeda,et al.  Electrical conductivity of the ZrO2–Ln2O3 (Ln=lanthanides) system , 1999 .

[14]  A. Yamaji,et al.  Structural phase transition and ion conductivity in 0.88ZrO2−0.12Sc2O3 , 1992 .

[15]  I. Chen,et al.  Cubic‐to‐Tetragonal (t') Transformation in Zirconia‐Containing Systems , 1992 .

[16]  R. Garvie,et al.  Intrinsic size dependence of the phase transformation temperature in zirconia microcrystals , 1986 .

[17]  F. Spiridonov,et al.  On the phase relations and the electrical conductivity in the system ZrO2Sc2O3 , 1970 .