SOLID-STATE IONIC CONDUCTORS AND METHODS OF MAKING THE SAME

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A solid-state ionic conductor. The solid-state ionic conductor contains a correlated perovskite into which ions and electrons are inserted giving rise to ionic conductivity. The inserted ions occupy interstitial lattice sites of the correlated perovskite, reduce the electronic conductivity of the correlated perovskite. A method of producing a solid-state ionic conductor. The method includes forming a thin film containing a transition metal X, a rare earth element R and oxygen (O) by co-depositing the transition metal and the rare earth element on a substrate in an oxygen-containing atmosphere. The thin film is then annealed at an annealing temperature for a period of time in an oxygen containing atmosphere, resulting in formation of a crystalline film of RXO3. Ions and electrons from an ion source are then inserted into the crystalline film of RXO3, resulting in a solid-state ionic conductor.