Novel inorganic fast proton-conductors have been successfully prepared by hydrogelation of calcium phosphate glass and subsequent precipitation of the thus formed Ca(H2PO4)(2).H2O hydrate crystals by heat treatment. The resulting calcium phosphate gel composites show a high conductivity of similar to2 x 10(-2) S/cm even at 30degreesC and are mechanically ductile. The high conductivities are attributed to fast proton transfer promoted by coexistence of large amounts of acidic POH groups and water molecules.