Effect of Heat Treatment on Ion Conductivity of Hydrated ZrO<sub>2</sub>Thin Films Prepared by Reactive Sputtering Using H<sub>2</sub>O Gas

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  • Effect of Heat Treatment on Ion Conductivity of Hydrated ZrO2 Thin Films Prepared by Reactive Sputtering Using H2O Gas

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Hydrated ZrO2 thin films were prepared by reactive sputtering using H2O gas, and these films were heat treated in air at temperatures from 100 to 350 °C. Absorbance peaks due to hydrogen-bonded OH groups for these samples were observed by Fourier transform infrared spectroscopy. The peak intensities were nearly the same before and after heat treatment below 200 °C, but began to decrease at 250 °C, and the absorption peak disappeared at 350 °C. Ion conductivity of the films was evaluated by AC impedance measurements and was found to be about 3 ×10-6 S/m before and after heat treatment at 200 °C; it also decreased after heat treatment above 250 °C. From these results, we considered that protons of OH and/or H2O in the films are the dominant ionic species that contribute to the ion conductivity of the films.

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