Journal
CRYSTAL GROWTH & DESIGN
Volume 10, Issue 2, Pages 602-607Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg900988j
Keywords
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Funding
- National Basic Research Program of China [2009CB939901]
- National Nature Science Foundation [20621061]
- Chinese Academy of Sciences [KJCX2-YW-H2O]
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The peculiar crystal structure of monoclinic BiVO4 endows it with fascinating and multifunctional properties for potential applications in a wide variety of areas. Notably, previous studies show that an intermediate product called tetragonal scheelite BiVO4 usually appears in the synthetic process of monoclinic BiVO4, which is contrary to the fact that the tetragonal BiVO4 is a high-temperature phase stable above 255 degrees C. Herein, we first clarify the intermediate product as BiVO4 center dot 4H(2)O instead of tetragonal BiVO4 through combination of thermogravimetric analysis (TGA), variable-temperature X-ray diffraction (XRD), differential scanning calorimetry (DSC), IR spectroscopy, and X-ray photoelectron spectroscopy (XPS) results. Moreover, due to the metastable state of BiVO(4 center dot)0.4H(2)O resulting from its lattice distortion, it gradually transforms to the final ellipsoidal monoclinic BiVO4 With the increase of reaction time in our system. Briefly, the present work not only shows prospective signs for studying the formation mechanism of various monoclinic BiVO4 products but also provides an effective strategy for elucidating the structural details of other hydrated compounds.
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