Hydrothermal synthesis of potassium molybdenum oxide bronzes: structure-inheriting solid-state route to blue bronze and dissolution/deposition route to red bronze |
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Authors: | Kazuo Eda Kin Chin M Stanley Whittingham |
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Institution: | a Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan b Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA |
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Abstract: | The hydrothermal syntheses of the alkali metal molybdenum bronzes from starting solids (HxMoO3) with structural affinities to the desired products were investigated. Single-phase potassium blue and red bronzes were prepared by the hydrothermal treatments at around 430 K, and characterized by powder X-ray diffraction, IR spectroscopy, and SEM. The formation processes of these two bronzes during the hydrothermal treatments were found to differ. The blue bronze was formed by a structure-inheriting solid-state route from HxMoO3 with x<0.3, whereas the red bronze was formed for x>0.3 through a solution dissolution/deposition route via the formation of MoO3+MoO2. |
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Keywords: | Low-temperature synthesis Hydrothermal synthesis Potassium metal molybdenum bronze Formation mechanism |
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