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    Investigation of Structural and Electrical Properties of (Bi2O3)1-x-y(CeO2)x(Eu2O3)y Electrolytes for Solid Oxide Fuel Cells
    (Polish Acad Sciences Inst Physics, 2019) Islek, Y.; Ozen, M. Kasikci; Kayali, R.; Ari, M.
    In the present study, CeO2 and Eu2O3 doped Bi2O3 composite materials for solid oxide fuel cells were investigated. (Bi2O3)(1-x-y)(CeO2)(x) (Eu2O3)(y) ternary systems (x = 0.01, 0.03, 0.05, 0.07, 0.09, 0.11 and y = 0.11, 0.09, 0.07, 0.05, 0.03, 0.01 dopant concentrations) were fabricated at different temperatures (650, 700, 750, and 800 degrees C) using conventional solid-state synthesis techniques. Characterization of these electrolyte samples were carried out by X-ray powder diffraction, differential thermal analysis/thermal gravimeter, and the four-point probe technique measurements. X-ray powder diffraction measurements showed that nearly all the samples have alpha+beta+gamma phase except the samples with tetragonal beta-phase sintered at 700, 750 degrees C and 750, 800 degrees C with the dopant ratios (x = 0.07, y = 0.05) and (x = 0.09, y = 0.03), respectively. Four-point probe technique measurements showed that the measured ionic conductivity of the stable samples vary in the range 1.05 x 10(-1)-4.76 x 10(-1) S/cm. Additionally, the activation energy values of the samples were calculated with the help of the Arrhenius equation adapted to the logs graphics versus 1000/T varying in the range 0.7799-0.8746 eV. This result shows that there is a good relationship between the activation energy values and conductivity values.