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The microstructure and conductivity property of Ca-doped CeO 2 were studied in a wide range of dopant concentrations (from 5 to 50at.%). Through detailed transmission electron microscopy and X-ray photoelectron spectroscopy investigations, we determined the secondary phase besides the doped ceria, clarified the solubility limit for the dopant and specified the reduction behavior of CeO ...
Grain size dependence of ionic conductivities of Ce1-xYbxO2-x/2 (x=0.10, 0.15, 0.20 and 0.25) was studied. The conductivity decreased with decreasing grain size and reached the minimum value at the grain size about 0.43-0.91 mum depending on different dopant concentration. Then the conductivity increased with a continuous decrease in grain size. TEM observation indicated that aforementioned conductivity...
The grain size dependence of electrolytic properties in 25 at.% yttrium doped ceria was investigated. The sintered bodies were prepared from fine Y0.25Ce0.75O1.875 powders synthesized by carbonate co-precipitation method. By using sintering temperature in range of 950deg-1400degC, the average grain size of electrolytes varied from 90 nm to 0.9 mum. The conductivity of samples with different grain...
Deformation behavior and cavitation characteristics of Al–4.5Mg–0.09Si and Al–4.5Mg–0.2Si alloys containing Mg 2 Si particles have been investigated at 613–693K. Tensile elongations above 350% were obtained in both alloys. Determination of the strain rate sensitivity and activation energy showed that in both alloys viscous dislocation glide creep deformation mechanism was operative and was...
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