Ionic conductivity of MgAl2O4-doped 8YSZ ceramics
- 22 Downloads
The effect of spinel (MgAl2O4) addition on the ionic conductivity of 8 mol.% yttria-stabilized cubic zirconia (8YSZ) was investigated using the impedance spectroscopy. Undoped and 1, 5, 10, and 15 wt.% MgAl2O4-doped 8YSZ powders were prepared via colloidal process to ensure uniform mixing of the powders and to obtain a homogeneous microstructure. The ionic conductivity of the specimens was measured using a frequency response analyzer in the range of 100 mHz–13 MHz and 300–800 °C. Complex impedance analysis results of MgAl2O4-doped 8YSZ specimens showed that the grain interior resistance increased with MgAl2O4 addition; on the contrary, it also decreased the grain boundary resistance. Furthermore, while the grain interior conductivity of 8YSZ was decreased with MgAl2O4 addition, the grain boundary conductivity of 8YSZ enhanced with the presence of electronically conductive spinel oxide precipitated at the grain boundaries of 8YSZ. Moreover, the addition of MgAl2O4 to 8YSZ resulted in a decrease in grain boundary activation energies.
Keywords8 mol.% yttria-stabilized cubic zirconia (8YSZ) MgAl2O4 Ionic conductivity Solid oxide fuel cell (SOFC)
The authors thank Gazi University and Marmara University, Turkey, for allowing the use of their laboratory facilities.
The authors would like to thank the scientific research projects of Harran University (HUBAP), Sanliurfa, Turkey, for the financial support in this study (Project No: K18188).
- AlHilli M.F, Mohammed N.I (2016) A study of the structural and electrical properties of MgAl2O4 doped with MnO2. Iraqi J Sci, Special Issue, Part B:370–379.Google Scholar
- Bates JL, Gamier JE (1981) Electrical conductivity of MgAl2O4 and Y3Al5O12. J Am Ceram Soc 64(10):C138–C141. https://doi.org/10.1111/j.1151-2916.1981.tb10237.x CrossRefGoogle Scholar
- Baudín C, Rafael M, Pena P (1995) High-temperature mechanical behavior of stoichiometric magnesium spinel. J Am Ceram Soc 78(7):1857–1862. https://doi.org/10.1111/j.1151-2916.1995.tb08900.x CrossRefGoogle Scholar
- Boubendira K, Labiod K, Benayache S, Aouadja F, Benfoughal A, Sassane N (2016) Study of structural and thermal properties of SiO2 and MgO in the diatomite. Int J Comp Exp Sci Eng 2(2):20–23Google Scholar
- Bradburn TE, Rigby GR (1953) The electrical conductivity of spinels. Trans Br Ceram Soc 52:417–435Google Scholar
- Lee M, (1992) Ionic conductivity measurement in MgAl2O4 spinel and solid state galvanic cell with MgAl2O4 electrolyte. Dissertation, Hongik University, Republic of Korea.Google Scholar
- Ozsoy M, Tikiz İ, Pehlivan H (2018) Thermal analysis of a zirconium dioxide coated aluminum alloy piston. Int J Comp Exp Sci Eng 4(3):43–50Google Scholar