Affiliation:
1. Materials Science & Engineering Department, University of Utah, USA
Abstract
Samples of 6 mol% Sc2O3 - 1 mol% CeO2 co-doped ZrO2 were fabricated by conventional ceramic processing methods and sintered at various temperatures from 1000 to 1650?C in air. The sintering conditions on microstructure and phase content are investigated using various characterization methods, including pycnometry, diffraction, and spectroscopy. The electrical conductivity of samples was investigated using electrochemical impedance spectroscopy (EIS). The effect of inductive load (measured from room temperature to 800?C) is discussed in low to high temperature regimes. At T<400?C since the arc is not a complete semicircle, the high-frequency arc could be fit using a constant phase element (CPE), while by subtraction of inductive load, a good fit is achieved using a capacitor element instead of CPE. The Arrhenius conductivity plot of samples reveals that the specimen sintered at 1600?C for 6 hours exhibits the highest conductivity. The activation energy (Ea) and conductivity preexponential (?0) factor are calculated from a linear fit to data that decreases by the increase in sintering temperature.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites
Reference83 articles.
1. S. Chu, A. Majumdar, Opportunities and challenges for a sustainable energy future, Nature. 488 (2012) 294-303.
2. P. Singh, N.Q. Minh, Solid oxide fuel cells: Technology status, Int. J. Appl. Ceram. Technol. 1 (2004) 5-15.
3. C. Pooya Elahi, J. Horsley, T.D. Sparks, Electrochemical and Degradation Studies on One-Dimensional Tunneled Sodium Zirconogallate + Yttria-Stabilized Zirconia Composite, Mixed Sodium and Oxygen Ion Conductor, (2022). https://doi.org/10.26434/CHEMRXIV-2022-6C4P3-V2.
4. P. Elahi, J.A. Horsley, T.D. Sparks, ECSarXiv Preprints | ¬¬Synthesis and Electrochemical Study of Multi-Phase, Multi-Species Ion Conductor Sodium β’’- Alumina (BASE) + 20SDC Using a Vapor-Phase Process, (2022). https://ecsarxiv.org/7scvq/ (accessed June 5, 2022).
5. P. Elahi, A. V. Virkar, Electrochemical Studies on Mixed Na+ - O2- ions Conducting Sodium Zirconium Gallate + YSZ Composite, in: 44th Int. Conf. Expo. Adv. Ceram. Compos., The American Ceramic Society, Daytona Beach, Florida, 2020: p. 58.