Abstract
Rapid quenching was applied to the sodium tungsten bronzes, NaxWO3, of differentx values. The crystallization processes of the coloured flakes obtained were analysed by differential thermal analysis and X-ray powder diffraction. It was found that an “amorphous bronze” phase is present in the quenched Na0.71WO3, whereas quenched Na0.84WO3 was composed of tungsten crystal and Na2O-WO3 glass. This difference is explained by the following equilibrium present in the melt of NaxWO3: 3xNa2WO4+(6−4x)WO3+xW⇄6NaxWO3 This equilibrium is shifted to the right whenx is small (x 0.8).
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