Improved ionic conductivity of zirconia-scandia with niobia addition |
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| Affiliation: | 1. Glass Research Department, National Research Centre (NRC), El-Buhouth Str., Dokki, 12622 Cairo, Egypt;2. Spectroscopy Department, National Research Centre (NRC), El-Buhouth Str., Dokki, 12622 Cairo, Egypt;1. Faculdade de Engenharia de Ilha Solteira, UNESP – Univ. Estadual Paulista, Departamento de Física e Química, 15385-000 Ilha Solteira, SP, Brazil;2. CNR, INO UOS A Gozzini, Area Ric Pisa S Cataldo, I-56124 Pisa, Italy;3. Univ. Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy;1. Department of Chemical Engineering, University of Vigo, P.O. Box 36310, Vigo, Spain;2. Universidade de Cabo Verde, Faculdade de Engenharías e Ciências do Mar, CP 163 São Vicente, Cabo Verde |
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| Abstract: | The ionic conductivity and the crystalline structure of ZrO2−10 mol% Sc2O3- x mol% Nb2O5 solid electrolytes were investigated for x=0.25, 0.5 and 1. Dense specimens with relative densities higher than 95% were prepared by solid state reaction and sintered at 1500 °C for 5 h. Full stabilization of the cubic structure at room temperature was obtained for compounds with x=0.5 and 1, whereas the cubic and rhombohedric structures coexist for x=0.25. The highest ionic conductivity in codoped system was found for specimen containing 0.5 mol% niobium pentoxide, with the same order of magnitude as that of the parent solid electrolyte (zirconia-10 mol% scandia) in the high temperature range (above 600 °C). Preliminary investigation on phase stability shows that the isothermal conductivity of the new solid electrolyte remained constant up to 100 h at 600 °C. Niobium pentoxide addition was found to improve the overall ionic conductivity of zirconia-scandia solid electrolyte. |
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| Keywords: | Stabilized zirconia Solid oxide fuel cell Ionic conductivity Niobium pentoxide |
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