Ammonium metatungstate hydrate undergoes a series of changes at high temperatures, which can be summarized as follows:
Loss of crystalline water
Ammonium metatungstate hydrate gradually loses its water of crystallization at high temperatures. This is a process of thermal decomposition in which water molecules escape from the crystal structure, leading to changes in the structure of the compound.
Formation of metatungstate
At the beginning of decomposition, ammonium metatungstate first loses its water of crystallization to form metatungstate. This is an intermediate step in which metatungstate is the predominant form present until all the water of crystallization is lost.
Further decomposition
As the temperature increases, metatungstic acid undergoes a further redox reaction, reducing it to tungsten oxide. This process releases oxygen and may be accompanied by the production of other gases such as ammonia.
Product Analysis
The main decomposition product of ammonium metatungstate hydrate at high temperature is tungsten oxide. In addition, reaction products such as ammonia and water may be produced. Tungsten oxide is the main product and can be used to prepare other tungstates and various tungsten alloys.
Decomposition Temperature
The decomposition temperature of ammonium metatungstate hydrate is usually in the range of 400°C to 500°C. This range may be affected by a number of factors. This temperature range can be affected by a variety of factors such as heating rate, atmosphere pressure and impurities.
Influencing factors
The exact details of the decomposition process and the composition of the products may be influenced by the experimental conditions. For example, different heating rates, type of atmosphere (e.g., pure hydrogen atmosphere), and purity of the feedstock may affect the decomposition temperature and product composition.
Safety Precautions
Since ammonium metatungstate hydrate will release gases such as oxygen and ammonia at high temperature, corresponding safety measures such as keeping good ventilation and avoiding ignition sources are required during the process.
Ammonium metatungstate hydrate will go through the process of losing crystallization water, forming metatungstic acid and further reducing to tungsten oxide at high temperature, and may produce reaction products such as ammonia gas and water. Its decomposition temperature is usually around 400°C-500°C, but the specific will be affected by the experimental conditions. Safety issues need to be taken care of in the process.
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