Structural, thermal and transport properties of textBtexti₄textV_{2 - textx}textGtexta_textxtextO_{11 - d} {text{B}}{{text{i}}_4}{{text{V}}_{2 - {text{x}}}}{text{G}}{{text{a}}_{text{x}}}{{text{O}}_{11 - delta }} (0 ≤ x ≤ 0.4)

摘要

Solid electrolytes are mostly used in solid oxide fuel cells (SOFC). In the present study, gallium-substituted compounds (; Me = Ga3+; 0≤x≤0.4) were prepared by solid-state reaction technique for its use as an electrolyte in SOFC. Structural and conductivity behavior was studied as a function of the Ga3+ substitution on vanadium site. The compounds remain in the orthorhombic α-phase for x = 0 and 0.1 whereas higher concentration of dopant leads to β-phase stabilization. The highest and lowest ionic conductivity were observed in x = 0.2 and x = 0.4 samples, respectively. The prepared samples were studied by using alternating current conductivity, differential thermal analysis and X-ray diffraction techniques. The results are discussed on the basis of formation of oxygen vacancy and its ordering.