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HNbWO6 and HTaWO6: Novel oxides related to ReO3 formed by ion exchange of rutile-type LiNbWO6 and LiTaWO6
Institution:1. Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea;2. Advanced Materials and Processing R&D Group, Korea Institute of Industrial Technology, Incheon 406-840, Republic of Korea;1. Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Sakh’yanova St. 6, Ulan-Ude, 670047 Buryat Republic, Russia;2. Buryat State University, Smolin St. 24a, Ulan-Ude, 670000 Buryat Republic, Russia;3. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Akad. Lavrentyev Ave. 3, Novosibirsk 630090, Russia;4. Novosibirsk State University, Pirogov St. 2, Novosibirsk 630090, Russia;5. Department of Chemistry, Moscow State University, Moscow 119899, Russia;1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland;2. Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland;3. Institute of Applied Physics, Military University of Technology, 2 Kaliskiego Street, 00-908 Warszawa, Poland
Abstract:Both LiNbWO6 and LiTaWO6 undergo ion exchange in hot aqueous H2SO4 yielding the hydrates HMWO6 · H2O (M = Nb or Ta). The reaction is accompanied by a structural transformation from the rutile to the ReO3 structure. The cell constants are a = 3.783(3)Å for HNbWO6 · H2O and a = 3.785(5)Å for HTaWO6 · H2O. The ReO3 structure is retained by the dehydration products HMWO6 and MWO5.5 as well. HMWO6 phases yield H1+xMWO6 hydrogen bronzes on exposure to hydrogen in the presence of platinum catalyst.
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