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WO 3 ·2H 2 O samples were prepared by acidic precipitation of sodium tungstate solution. Nanocrystalline WO 3 powders were obtained after 350 and 600°C calcinations. XRD patterns of these samples showed a diffraction profile similar to that of monoclinic WO 3 . Calcinations at 600°C yield WO 3 powders with particle sizes ranging from 60 to170nm whereas that...
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