Ammonium metatungstate hydrate

Reliance on mass balance calculations requires extensive knowledge of precursor physical properties. Many transition metal oxide precursors are hydrated salts with variable molecules of water incorporated in their crystal structure, such as ammonium metatungstate ((NH4)gH2W,204oXH20). The amount of hydrated water (x) varies, depending on the manufacturer and atmospheric moisture thermogravimetric analysis should be performed to quantify the water content of the metal salt hydrates for accurate calculations of surface oxide content. 

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