The decomposition temperature of ammonium metatungstate varies with the degree of completion of the decomposition reaction. This also means that ammonium metatungstate produces different products at different decomposition temperatures.
Decomposition temperature and decomposition products of ammonium metatungstate
When the heat treatment temperature is 200-300°C, all crystal water and most of the ammonium ions are removed;
A phase transition occurs at a temperature of 300-350°C to generate metastable tungsten oxide;
When the heat treatment temperature rises to 500-550°C, there is still a small amount of ammonium radicals and bound water not decomposed;
When the heat treatment temperature is above 600°C, it will be completely decomposed into tungsten trioxide (WO3);
When the temperature rises to 700°C and the holding time is 2 hours, a hollow mesoporous tungsten trioxide ball can be obtained.
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