Gel-combustion synthesis of NiO-MoO3 mixtures and their reduction to Ni-Mo alloys

By heating in hydrogen atmosphere, the oxide mixtures were transformed into Ni-Mo alloys. Thermogravimetric study of the reduction procedure evidenced that temperature indispensable to complete reduction increased progressively from 400 to 900 °C if x decreased from 1 toward 0. The structure of Ni-Mo alloys was examined by X-ray diffractometry, and the following alloys were evidenced: Ni(Mo) solid solutions, Ni4Mo, and NiMo.