By Narottam P. Bansal, Prabhakar Singh, Sujanto Widjaja, Dileep Singh
This ebook is a set of papers from the yank Ceramic Society's thirty fifth overseas convention on complex Ceramics and Composites, held in Daytona seashore, Florida, January 23-28, 2011. This factor contains papers offered within the eighth foreign Symposium on reliable Oxide gas Cells: fabrics, technology, and know-how on issues similar to phone and Stack improvement; Electrochemical/Mechanical/Thermal functionality; Electrodes; Interconnects; Novel Cell/Stack layout and Processing; and Reliability/Degradation.Content:
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Additional resources for Advances in Solid Oxide Fuel Cells VII: Ceramic Engineering and Science Proceedings, Volume 32
424,315-21 (2006). -S. Cho, S. B. -S. -H. -Y. -M. Park. Improvemen t of Grain-Boundary Conduction in Gadolinia -Doped Ceria by Addition of CaO, Electrochem. S. S. , 9, A399-A402 (2006). 30 B. S. Banerjee , P. S. Davi, D. Topwal, S. Mandai and K. 20i. 4 (2007). 9: Unique Effect of Calcium Co-doping, Adv. Func. , 17,2847-5 3 ’A . Moure, J. Tartaj, C. Moure, Synthesis, sintering and electrica l propertie s of gadolinia-calcia-dope d ceria, Mat. Let, 65, 89-91 (2011). 32 M . Dudek, A. Rapacz-Kmita, M .
Figure 4. gLno^Oz-s at 873-1173 K (a) and 673-873 K (b). 0 >40 "2 Sm /cm at 1173 K) (Fig. 5), but an effect of Advances in Solid Oxide Fuel Cells VII • 27 Effect of Dopants on Ce0 2 Based Solid State Electrolytes increasing of conductivit y under co-doping of Ce 2by two rare earth element s was not confirmed . As a rule the values of conductivit y of the three-componen t systems are equal to the average value of conductivitie s of the relevant two-componen t systems. In fig. 6the concentratio n dependence s of total conductivit y at 1173 K for Cei-xLnx02-8 solid solutions and multi-componen t Cei-xLn^Ln’^^-s systems are presented .
Fig. 2026 solid solutions in high (873-1173 K) and low (673-873 K) temperatur e ranges. As the transitio n point betwee n the temperature’ s ranges a critical temperatur e Tc of 873 K was taken. 9 5 - 856 – 45 K ) the formatio n of the dopant cation - oxygen vacancies complexes plays a significant role. The dopant cations may not only actjust as traps for isolated vacancies,but also as nuclei for the formation of ordered-vacanc y clusters. In accordanc e with this assumption the Arrenius plot for ceria based systems would gives two straight lines, which intersect s at Tc with activatio n energies Ei=A H and Ei=AH m +AH t, where AH m - the migration energy of oxygen vacancies, AH t - the trapping energy betwee n vacancies and cations .