APT closed calcination method:
Maintain positive pressure in the furnace,
Ammonia cracks hydrogen and nitrogen, maintaining a weak reducing atmosphere
The final product is a blue oxide
APT hydrogen mild reduction method:
After APT is loaded into a boat, it is placed in a furnace tube to be heated and decomposed.
Send hydrogen, maintain reducing atmosphere
blue tungsten oxide
Internal restoration method:
Dissolve tungstic acid in ammonia water, add urea to prepare intermediate (IRT),
IRT is thermally decomposed in nitrogen flow, and the blue tungsten oxide is produced by the decomposition and reduction of ammonium inside the molecule.
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