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Preparation and Properties for Solid Solution Ce0.8Pr0.2-xSmxO2-δ(x=0.02, 0.05, 0.1)

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Abstract:

Ce0.8Pr0.2-xSmxO2-δ(x=0.02, 0.05, 0.1) solid solutions were synthesized by the sol-gel method. The XRD results show that all powders calcined at 800 °C are crystallized in a single cubic fluorite structure. The average grain sizes are between 19 nm and 28 nm. The Raman spectra analysis reveals that the solid solution Ce0.8Pr0.2-xSmxO2-δ has a cubic fluorite structure with oxygen vacancies. The oxygen vacancy concentration is increased by doping Sm in Ce0.8Pr0.2-xSmxO2-δ. Impedance spectra shows that the conductivity of rare earth co-doped ceria Ce0.8Pr0.15Sm0.05O2-δ is higher than that of single rare earth doped ceria Ce0.83Sm0.17O2-y. The results also show that Ce0.8Pr0.15Sm0.05O2-δ possess maximum conductivity. At 600 °C, the conductivity is 1.20×10-2S/cm, which is assigned to the higher oxygen vacancy concentration and the hopping electron transition of small polarons in the sample Ce0.8Pr0.15Sm0.05O2-δ.

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Applied Mechanics and Materials III View Preview

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Periodical:

Applied Mechanics and Materials (Volume 723)

Pages:

596-600

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.723.596

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Online since:

January 2015

Authors:

Li Li Zhu, Xiao Min Lin*, Li Jing Qi

Keywords:

Cerium-Praseodymium-Samarium Compound, Impedance Spectra, Oxygen Vacancy, Raman Spectra

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