Abstract
Na 2Ti 3O 7 and Na 2Ti 6O 13 were synthesized by sol–gel method in order to obtain pure phases. Different heat-treatments were applied on powders and pellets of these materials. The effects were studied by XRD, dilatometry, TGA-DTA, SEM and electrochemical impedance spectroscopy. Pure Na 2Ti 3O 7 was obtained at 973 K. Sintering at 1373 K caused a partial decomposition into Na 2Ti 6O 13. The Na 2Ti 3O 7 powder sintered at 1273 K showed polygonal microstructure. Na 2Ti 3O 7 pellets sintered at 1323 K for 10 h exhibited large structures. This latter microstructure decreased the electrical conductivity of Na 2Ti 3O 7. Pure Na 2Ti 6O 13 was obtained at 873 K. Sintering at 1073 K caused a partial decomposition into TiO 2 (rutile). Na 2Ti 6O 13 pellets sintered at 1323 K for 10 h exhibited common shrinkage behavior. This shrinkage process increased the electrical conductivity of this material. The presence of TiO 2 resulted in a oxygen partial pressure dependence of the electrical conductivity.
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