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Niobates and tantalates of rare-earth compounds are high\udtemperature proton conductor (HTCP) oxides that are gaining\udattention as possible stable electrolyte materials for application in\udintermediate temperature solid oxide fuel cells (IT-SOFCs).\udSr0.02La0.98Nb0.6Ta0.4O4 was synthesized by auto-combustion and\udco-precipitation routes, and by solid state reaction for sake of\udcomparison, expecting an improvement in conductivity for the wet\udchemistry routes over the conventional solid state reaction method.\udSingle phase materials were obtained at 1100°C by autocombustion\udand by co-precipitation. The synthesized powders were\udcharacterized by X-ray diffraction (XRD) and dilatometric\udanalyses. Dense electrolytes were obtained by pressing the\udcalcined powders into cylindrical pellets and then sintering at\ud1600°C for 10 h. The pellets were observed by scanning electron\udmicroscopy (SEM). Electrical conductivity of the sintered pellets\udwas measured as a function of the temperature by electrochemical\udimpedance spectroscopy (EIS) measurements. Proton conductivity\udof 2.2×10-4 S cm-1 was obtained in wet argon atmosphere at 800°C\udfor the sample produced via auto-combustion

Soft Chemistry Routes for the Synthesis of Sr0.02La0.98Nb0.6Ta0.4O4 Proton Conductor

Soft Chemistry Routes for the Synthesis of Sr_0.02La_0.98Nb_0.6Ta_0.4O₄ Proton Conductor