LAUSR

Abstract In this study, (Bi 2 O 3 ) 1-x-y (Tb 4 O 7 ) x (Gd 2 O 3 ) y (xTbyGdSBi) ternary solid solutions were synthesized via the solid-state synthesis technique. The phase structures of electrolytes were defined by X-ray powder diffraction (XRD) and differential thermal analysis/thermal gravimetric techniques (DTA/TG). The total electrical conductivity (σ T ) was measured with respect to the test temperature and doping concentration by using four-point probe technique (4PPT). Measurement results showed that δ-phase was obtained in test specimens and the conductivity of the electrolytes increased with increasing test temperature and decreasing amount of Gd 2 O 3. The 5Tb5GdSBi ternary system had the highest conductivity value of 3.88 × 10 −1 S cm −1 at 850 °C. Compared to the literature, the results from this study are reasonably promising.