Dopant-concentration dependence of grain-boundary conductivity in ceria: A space-charge analysis

2009 ◽  
Vol 19 (27) ◽  
pp. 4837 ◽  
Author(s):  
Hugo J. Avila-Paredes ◽  
Kwanghoon Choi ◽  
Chien-Ting Chen ◽  
Sangtae Kim
Keyword(s):  
Grain Boundary ◽  
Space Charge ◽  
Concentration Dependence ◽  
Dopant Concentration ◽  
Boundary Conductivity ◽  
Charge Analysis

Ionic Conductivities and Microstructures of CeO2:Y203 Solid Electrolytes

1998 ◽  
Vol 548 ◽  
Author(s):  
Chunyan Tian ◽  
Siu-Wai Chan
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Solid Electrolytes ◽  
Dopant Concentration ◽  
Ionic Conductivities ◽  
Oxygen Depletion ◽  
Boundary Conductivity ◽  
Size Dependent ◽  
Impurity Segregation ◽  
Microanalytical Technique

ABSTRACTIonic conductivities of solid CeO2:Y203 electrolytes were systematically investigated as a function of dopant concentration and sintering temperatures. The highest lattice conductivity occurred at 6–8% dopant concentration, and maximum grain boundary conductivity was observed at 10% dopant concentration. The sintering temperature was found to have a significant effect on the conductivities of the pellets. The samples sintered at lower temperatures (T≤140°C) showed higher grain boundary conductivity than those sintered at 150°C; this was found to be related to size-dependent-impurity segregation and precipitation at grain boundaries. The grain boundary conductivities as related to the microstructure are discussed by adopting different grain boundary models. Solute segregation and oxygen depletion at grain boundaries, which have been suggested to be responsible for the grain boundary resistivities in these samples, were examined by a microanalytical technique for small-grain-size samples.

Grain boundary conductivity of zirconia yttria and the space charge concept

1998 ◽  
Vol 146 (1-4) ◽  
pp. 215-227 ◽  
Author(s):  
Milton Ferreira de Souza ◽  
Dulcina P. F. de Souza
Keyword(s):  
Grain Boundary ◽  
Space Charge ◽  
Boundary Conductivity

Improving Grain Boundary Conductivity of Ce 0.9 Gd 0.1 O 2 −  δ Electrolyte through Compositing with Carbonate or Semiconductor

2020 ◽  
Vol 8 (9) ◽  
pp. 2000424
Author(s):  
Xiaomi Zhou ◽  
Chen Xia ◽  
Xunying Wang ◽  
Wenjing Dong ◽  
Baoyuan Wang
Keyword(s):  
Grain Boundary ◽  
Boundary Conductivity

On determining the height of the potential barrier at grain boundaries in ion-conducting oxides

2016 ◽  
Vol 18 (4) ◽  
pp. 3023-3031 ◽  
Author(s):  
Sangtae Kim ◽  
Seong K. Kim ◽  
Sergey Khodorov ◽  
Joachim Maier ◽  
Igor Lubomirsky
Keyword(s):  
Grain Boundary ◽  
Space Charge ◽  
Grain Boundaries ◽  
Potential Barrier ◽  
Boundary Resistance ◽  
Resistivity Ratio ◽  
Linear Diffusion ◽  
Conducting Oxides ◽  
Ion Conducting

Combining the linear diffusion and resistivity ratio models, one can distinguish the grain boundary resistance related to space charge from the resistance from other sources.

scholarly journals Space–charge theory applied to the grain boundary impedance of proton conducting BaZr0.9Y0.1O3−δ

2010 ◽  
Vol 181 (5-7) ◽  
pp. 268-275 ◽  
Author(s):  
Christian Kjølseth ◽  
Harald Fjeld ◽  
Øystein Prytz ◽  
Paul Inge Dahl ◽  
Claude Estournès ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Space Charge ◽  
Proton Conducting ◽  
Boundary Impedance
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