HYDROTHERMAL SYNTHESIS OF BIMETALLIC PLATINUM-NICKEL POWDERS AND THEIR STRUCTURAL CHARACTERISTICS

The processes of combined reduction of platinum and nickel complex compounds from ammonia-alkaline aqueous solutions with hydrazine hydrate under hydrothermal autoclave conditions were studied. It was found that quantitative precipitation of nickel and platinum occurred within 1 hour at a temperature of 110°C. All phases formed had fcc lattices and exhibited ferromagnetic properties. X-ray phase analysis confirmed the formation of solid platinum-nickel substitution solutions. The composition of these solutions could be varied by changing the initial molar ratio of the metals. The materials demonstrated chemical and structural stability in a 1 M hydrochloric acid solution.