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A hexagonal form of tungsten trioxide (h‐WO3, particle size: 15.9‐57.1 nm) was found to be formed by a direct reaction between metallic tungsten powder (W, particle size: 0.45‐0.59 μm) and 15%‐30% hydrogen peroxide (H2O2) aq solution. Oxide film on the powder surface having the similar crystal structure as h‐WO3 was essential for the formation, and the surface oxide film was formed by aging the powder...
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