Özet:
In the present work, Dy2O3 and Sm2O3 double-doped Bi2O3-based materials are synthesized by exploiting
the solid-state synthesis method. The structural and temperature dependent electrical properties of these
ternary ceramic samples, which are candidate materials for solid oxide fuel cell (SOFCs) electrolyte, are
determined by means of a powder X-ray diffractometer (XRD), the four point-probe method (FPPM), and
the thermal-gravimetry/differential thermal analysis (TG/DTA). As a result of the XRD measurements, the
fluorite-type fcc δ-phase with a stable structure is obtained for higher values of the dopant oxide material,
which are the samples with the maximum content of fixed 20% Dy2O3 and 15% and 20% Sm2O3. The
samples with the stable δ-phase structure have higher conductivities. The highest electrical conductivity is
found for the (Bi2O3)0.6(Dy2O3)0.2(Sm2O3)0.2 sample, which was 2.5×10–2 (Ohm cm)–1 at 750 °C. The
activation energies are also calculated from the Arrhenius charts, which were determined from the FPPM
measurements. The lowest activation energy is found as 0.85 eV for the sample with the highest electrical
conductivity.