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Influence of Co3O4 addition on the ionic conductivity and microstructural properties of yttria-stabilized zirconia (8YSZ)

  • Bulent Aktas and Suleyman Tekeli
Published/Copyright: June 1, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 6

Abstract

In this study, 0 – 15 wt.% Co3O4 powders were added to 8 mol.% yttria-stabilized cubic zirconia (8YSZ) powders in order to determine the effect of Co3O4 addition and amount on the microstructure, sintering, and electrical properties of yttria-stabilized cubic zirconia. Colloidal processing was used to ensure uniform mixing of the powders and to obtain a homogeneous microstructure. X-ray diffraction results showed that the average lattice parameter of the yttria-stabilized cubic zirconia decreased from 5.146 Å to 5.135 Å upon Co3O4 addition, and that the lattice parameter did not change above a Co3O4 content of 1 wt.%. The initial decrease in the lattice parameter is attributable to the smaller ionic radius of Co3+ dissolved in the yttria-stabilized cubic zirconia matrix. The electrical conductivity of the specimens was measured using a frequency response analyzer in the range of 100 mHz – 13 MHz and 300 – 800 °C. Grain boundary conductivity of yttria-stabilized cubic zirconia was found to be enhanced with increasing Co3O4 addition, with the presence of electronically conductive cobalt oxide at grain boundary triple points increasing the grain boundary conductivity, due to an increase in the Co3+ and Co2+ electronic charge carrier ions.

Keywords: Yttria-stabilized zirconia (8YSZ); Ionic conductivity; Solid oxide fuel cell (SOFC); Co3O4; Sinterability
*Correspondence address, Assist. Prof. Bulent Aktas, Harran University, Osmanbey campus, Engineering Faculty, Department of Mechanical Engineering, 63300, Sanliurfa, Turkey, Tel: +90 414 3183000, Fax: +90 414 3183799, E-mail:

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Received: 2013-08-17
Accepted: 2014-01-16
Published Online: 2014-06-01
Published in Print: 2014-06-12

© 2014, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Thermodynamic modeling of the In–Pt–Sb system
  5. Classical controlled rolling of low C steels microalloyed with Ti and Mo
  6. Development of carbide intermetallic layer by electric discharge alloying on AISI-D2 tool steel and its wear resistance
  7. Comparison of fatigue crack growth rate of selective laser sintered RapidSteel via computational fracture mechanics
  8. Wear resistance and fracture mechanics of WC–Co composites
  9. Thermal expansion behavior of CNT/Ag nanocomposite
  10. Thermophysical properties of solid phase rhodium measured by the pulse calorimetry technique over a wide temperature range
  11. Influence of Co3O4 addition on the ionic conductivity and microstructural properties of yttria-stabilized zirconia (8YSZ)
  12. High-activity of Pd catalyst supported on antimony tin oxide for hydrogen peroxide electroreduction
  13. Investigation of low k interfacial layer characteristics of LaAlO3 thin films grown on Si (100)
  14. In-situ catalytic growth of MgAl2O4 spinel whiskers in MgO–C refractories
  15. Short Communications
  16. Preparation and characterization of boron nitride/carbon fiber composite with high specific surface area
  17. Crevice corrosion resistance of high alloyed materials in 3.5 % NaCl solution
  18. Effect of grain size on the microstructure and mechanical properties of Mg-4Y-3Nd-0.5Zr alloy
  19. People
  20. Professor Ulrich Martin on his 65th birthday
  21. DGM News
  22. DGM News
https://doi.org/10.3139/146.111068
Keywords for this article
Yttria-stabilized zirconia (8YSZ); Ionic conductivity; Solid oxide fuel cell (SOFC); Co3O4; Sinterability

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Thermodynamic modeling of the In–Pt–Sb system
  5. Classical controlled rolling of low C steels microalloyed with Ti and Mo
  6. Development of carbide intermetallic layer by electric discharge alloying on AISI-D2 tool steel and its wear resistance
  7. Comparison of fatigue crack growth rate of selective laser sintered RapidSteel via computational fracture mechanics
  8. Wear resistance and fracture mechanics of WC–Co composites
  9. Thermal expansion behavior of CNT/Ag nanocomposite
  10. Thermophysical properties of solid phase rhodium measured by the pulse calorimetry technique over a wide temperature range
  11. Influence of Co3O4 addition on the ionic conductivity and microstructural properties of yttria-stabilized zirconia (8YSZ)
  12. High-activity of Pd catalyst supported on antimony tin oxide for hydrogen peroxide electroreduction
  13. Investigation of low k interfacial layer characteristics of LaAlO3 thin films grown on Si (100)
  14. In-situ catalytic growth of MgAl2O4 spinel whiskers in MgO–C refractories
  15. Short Communications
  16. Preparation and characterization of boron nitride/carbon fiber composite with high specific surface area
  17. Crevice corrosion resistance of high alloyed materials in 3.5 % NaCl solution
  18. Effect of grain size on the microstructure and mechanical properties of Mg-4Y-3Nd-0.5Zr alloy
  19. People
  20. Professor Ulrich Martin on his 65th birthday
  21. DGM News
  22. DGM News
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