The preparation methods of blue tungsten mainly include ammonium paratungstate (apt) closed calcination method, apt hydrogen reduction method, etc. The structure of violet tungsten is octahedral with strong cracking and deformation, showing purple or blue-purple needle-like or linear crystals. It needs to be obtained by reducing and deoxidizing apt as raw material in argon at a precisely controlled temperature. Violet tungsten has many oxygen vacancies and has high chemical activity. It is the preferred material for producing ultrafine tungsten powder or nano tungsten powder, photocatalytic materials, petroleum catalysts, and microelectronic integrated circuit boards. It has great commercial potential.
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