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Proton conductive material comprising a compound of a monoclinic crystal structure which is in a reversibly reduced state from a compound of a similar monoclinic crystal structure represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16, in which 1.5≤x≤2, 1.5≤y≤2, x≥y. The compund of a monoclini

Proton conductive material comprising a compound of a monoclinic crystal structure which is in a reversibly reduced state from a compound of a similar monoclinic crystal structure represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16, in which 1.5≤x≤2, 1.5≤y≤2, x≥y. The compund of a monoclinic crystal structure, represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16 is changed reversibly to a compound of a monoclinic crystal structure in a reduced state by a reducing treatment at a temperature within a range from 600°°C. to 1000°C. Such a compound of a monoclinic crystal structure which is in a reduced state is changed reversibly back to the compound of a monoclinic crystal structure, represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16 by applying heat treatment in air at a temperature within a range from 1200°C. to 1300°C. A method of producing such proton conductive material comprises the steps of mixing starting alumina material, starting titania material and a sodium salt, sintering at a temperature within a range from 1000°C. to 1300°C. and then applying a reducing treatment in a hydrogen atmosphere at a temperature within a range from 600°C. to 1000°C.

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Proton conductive material comprising a compound of a monoclinic crystal structure which is in a reversibly reduced state from a compound of a similar monoclinic crystal structure represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16, in which 1.5≤x≤2, 1.5≤y≤2, x≥y, the lattice parameter bo of

Proton conductive material comprising a compound of a monoclinic crystal structure which is in a reversibly reduced state from a compound of a similar monoclinic crystal structure represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16, in which 1.5≤x≤2, 1.5≤y≤2, x≥y, the lattice parameter bo of the compound of a monoclinic crystal structure in a reduced state being greater by more than 0.001 nm than the lattice parameter bo of the compound of a similar monoclinic crystal structure represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16. wherein the compound of a monoclinic crystal structure in a reduced state is formed by applying a reducing treatment to the compound of a similar monoclinic crystal structure represented by the general formula: NaxAlyTi3+x-yTi4+8-xO16 in a hydrogen atmosphere and at a temperature of from 600°C. to 1000°C.