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Sodium beta-alumina is a Na ions conductor ceramic used as solid electrolyte in sodium batteries for energy storage in solar and eolic plants. Due to its high content of sodium, this material is instable at high temperatures and can suffer decomposition during conventional sintering (high temperatures for long periods of time). Flash sintering is an electric current activated sintering technique which promotes the densification of ceramic powder compacts in a few seconds at significantly lower temperatures than conventional sintering. Since in flash sintering the electric current flows through the sample, the flash sintering of any conductor material seems to be reasonable. Nevertheless, up to this date all published papers concern flash sintering of oxygen vacancies conductors or semi-conductors, materials which are compatible with platinum (Pt) electrodes. In this work the flash sintering of the cationic conductor betaalumina was studied. Beta-alumina was synthetized by the polymeric precursors method, characterized and then it was submitted to flash sintering. Platinum electrode was shown to be a blocking electrode for beta-alumina. Flash sintering success was determined by the change in electrode’s material to silver (Ag), which made possible the reversible electrochemical reaction at the electrode-electrolyte interfaces and preserved chemical composition and morphology after flash. Due to this electrolyte metastability, atmosphere had to be changed in order to preserve the chemical composition of an alkali-rich (Na) material such as beta-alumina. The flash sintering of a cationic conductor is shown for the first time in the literature and highlights the relevance of electrode reaction, which is a limiting point to the success of a flash sintering and needs to be well studied and adapted to each type of material. Key-words: flash sintering, beta-alumina, cationic conductor, electrode reaction.

Sinterização flash do condutor catiônico beta-alumina sintetizada pelo método dos precursores poliméricos.