PEROVSKITE OXIDE CONTAINING HYDRIDE ION, AND METHOD FOR MANUFACTURING SAME >
[Problem] Many oxide-ion conductors exhibit high functionality at high temperatures due to the large weight and charge of the oxide ions, and it has been difficult to achieve the functionality at low temperatures. [Solution] A perovskite oxide having hydride ion conductivity, at least 1 at.% of the oxide ions (O2-) contained in a titanium-containing perovskite oxide being substituted by hydride ions (H-). This oxide, in which negatively charged hydride ions (H-) are used for the ionic conduction, has a combined hydride ion conductivity and electron conductivity. As a starting material, the perovskite-type, titanium-containing oxide is kept together with an alkali metal or alkaline-earth metal hydride powder selected from LiH, CaH2, SrH2, and BaH2 in a temperature range from 300 DEG C to below the melting point of the hydride in a vacuum or an inert gas atmosphere, and some of the oxide ions in the oxide are substituted by the hydride ions to introduce the hydride ions to oxygen sites.