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Sodium Ammonium Phosphate (Crystals Cristaux) Molecular Formula: NaNH 4 (HPO 4)·4H 2 O: Molecular Weight: 209.07: Melting point: 980 °C: Chemical Abstract Number: 51750-73-3 About Arsenic Phosphide Sputtering Target American Elements specializes in producing high purity Arsenic Phosphide Sputtering Targets with the highest possible density and smallest possible average grain sizes for use in semiconductor, chemical vapor deposition (CVD) and physical vapor deposition (PVD) display and optical applications. Arsenic Phosphide is a semiconductor used in high power, high frequency applications and in laser diodes. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Ammonium arsenate is the inorganic compound with the formula (NH 4) 3 AsO 4.It is prepared by treating a concentrated solution of arsenic acid with ammonia, resulting in precipitation of colorless crystals of the trihydrate.