An intermediate temperature proton-conducting amorphous material was prepared utilizing the reaction of zinc metaphosphate glass powders with imidazole. The anhydrous material, consisting of Zn-coordinated imidazole and imidazole/phosphoric acid composite groups with imidazole, showed no decrease in weight even after heating at 200 degrees C. It showed high electrical conductivities of 0.2-4 mS cm(-1) at the temperature range of 110-180 degrees C. The activation energy for electrical conduction (similar to 0.6 eV) was close to that for proton transport between basic heterocycle molecules. A H-2/O-2 fuel cell test using the material as the electrolyte showed an output power of 16 mW cm(-2) at 150 degrees C.