Divalent magnesium ion conducting characteristics in phosphate based solidelectrolyte composites

The divalent Mg2+ ion conducting solid electrolyte was synthesized with a c omposite form by intentionally changing the starting material mixing ratio to the nonstoichiometric region. By such a preparation technique, spontaneo us and microscopic dispersion of the secondary Zr2O(PO4)(2) phase was succe ssfully realized and the Mg2+ ion conductivity was considerably enhanced by dispersing the secondary phase, showing the highest conductivity among the Mg2+ ionic conducting solid electrolytes reported. The Mg2+ migration in t he composite solid was clearly demonstrated by dc electrolysis and the Mg2 ion transference number was precisely determined to be unity by a modified Tubandt method. The development of pure Mg2+ ion conducting phosphate base d solid electrolytes with high stability and considerably high ionic conduc tivity contributes greatly to opening a new door for the application of adv anced materials such as rechargeable batteries and other specific sensor el ements.