Ammonium tetrathiotungstate is a chemical compound with the chemical formula .
Synthesis Ammonium tetrathiotungstate can be obtained by the reaction of tungstic acid, ammonia, and hydrogen sulfide in a water bath at 65-70°C:
Physical properties Ammonium tetrathiotungstate forms yellow to orange crystals, soluble in water.
The compound decomposes under heat to produce tungsten trisulfide at 170-280°C and tungsten disulfide at 260-500°C.
Uses The compound is used in materials science and catalysis.
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