Changes in structure and electrical conductivity of some rare-earth-doped ceria induced by strontium addition
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In order to investigate the effect of strontium addition on the structure and ionic conductivity of rare-earth-doped ceria, powders with composition Ce0.85Dy0.15-xSrxO2-δ (x = 0, 0.05, 0.075) and Ce0.85Yb0.15-xSrxO2-δ (x = 0, 0.05, 0.075) are synthesized using a Pechini method. X-ray diffraction (XRD) and Raman spectroscopy analysis evidence the formation of single-phase solid solutions for all investigated powders and their corresponding sinters. An increase in grain size with strontium content is evidenced by scanning electron microscopy (SEM). Electrochemical impedance spectroscopy allows only the determination of total ionic conductivity of the investigated samples. The sample with stoichiometry Ce0.85Yb0.10Sr0.05O2-δ exhibits the highest ionic conductivity (8.6 × 10−4 S/cm at 500 °C) and the lowest activation energy of conduction (0.71 eV) among all investigated samples. The activation energy of conduction has a dominating effect on ionic conductivity for Ce–Yb system.
KeywordsCeria Doping Sol-gel Impedance spectroscopy Ionic conductivity
UEFISCDI financial support in the framework of research project PN-II-PT-PCCA-2011-3.1-1423 (no 26/2012) is greatfully acknowledged. POSCCE project no 256/2010 « Research Infrastructure in Applied Sciences - INCESA » is acknowledged for fundings of the analytical equipments.
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Conflict of interest
The authors declare that they have no conflict of interest.
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