A manufacturing method of a solid electrolyte

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PROBLEM TO BE SOLVED : To provide a solid electrolyte which has a crystalline phase expressed by Na5XSi4O12(X consists of ≥1 kind of rare earth elements, such as Dy, Gd, y and Sm), is provided with a skeleton having a network structure for effectively diffusing sodium ions into this phase and high polarizability and has excellent ion conductive properties and chemical stability. SOLUTION : The solid electrolyte consists of a sintered oxide compact containing the rare earth elements (X), such as Dy, Gd, Y and Sm, and having the crystalline phase expressed by Na5XSi4O12and is so composed that the electric conductivity at room temperature attains 10-3to 10-2S. cm-1. COPYRIGHT : (C)2003, JPO