Structural properties and state of the surface layer of zirconium dioxide modified by tungstate anions |
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Authors: | L. I. Kuznetsova A. V. Kazbanova L. A. Solovyov Yu. L. Mikhlin E. A. Paukshtis P. N. Kuznetsov |
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Affiliation: | 1. Institute of Chemistry and Chemical Engineering, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia 2. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
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Abstract: | A tetragonal metastable phase of zirconium dioxide formed after the addition of tungstate anions (>13 mol %) to the hydroxide precursor by different methods with heating (600–700°C), as revealed by X-ray diffraction analysis and X-ray photoelectron and IR spectroscopy. The W6+ and W5+ cations formed a solid solution with ZrO2. On the surface of the solid solution, the tungsten cations formed tungstate clusters (?WO x ?)n. The formation of the WO3 phase was observed at concentrations of tungstate anions higher than 17.6 mol % or at temperatures of 850–870°C. |
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