Use of Ozone to Prepare Silver Oxides |
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Authors: | Ryosuke O Suzuki Takamichi Ogawa Katsutoshi Ono |
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Affiliation: | Department of Energy Science and Technology, Kyoto University, Kyoto 606–8501, Japan |
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Abstract: | The possible use of ozone to produce higher oxides was analyzed thermodynamically. Because the activity of oxygen in ozone is ~1018 at room temperature and ~108 at 773 K, ozone may react with metals to yield higher-oxidation-state products than does an ambient pressure of pure oxygen. In agreement with this thermodynamic prediction, silver oxides (AgO and Ag2O) were synthesized experimentally by blowing a gas mixture of 6 vol% ozone and oxygen through a water-cooled lance. Neither Ag3O4 nor Ag2O3 was detected. Slow oxygen diffusion into a metal and/or reaction products and decomposition of unstable oxides that are formed successively are obstacles to practical applications of syntheses via ozone oxidation. |
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