Solid electrolyte of sodium beta-alumina

Reference	Presenter	Authors (Institution)	Abstract
06-088	Vera Lúcia Arantes	Arantes, V.L.(Universidade de São Paulo);	In the 70's and 80's, a new type of sodium battery was developed which brought about a great interest for employment in stationary storage banks. This device is based on the use of a solid electrolyte ?/?''-Al2O3 that allows the transport of sodium ions between the electrodes. The solid electrolyte ?/?''-Al2O3 presents a differentiated crystalline structure that allows great mobility of the sodium ions. The present work has as main objective to obtain solid electrolyte ?/?''-Al2O3, using powders prepared by mixing and milling process, conventional sintering and in two step sintering and to evaluate its electrical performance. The relative levels of the ?/?''-Al2O3 phases were temperature dependent. The evolution of the microstructure underwent grain growth forming a duplex microstructure. The impedance spectroscopy technique was important in the identification of the phases present in the ceramic ?/?''-Al2O3 and in the electric conduction mechanism. Based on the analysis of the impedance data, it was possible to calculate the activation energy associated to the conduction mechanisms.
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