Further experiments of the volatilization of platinum

Further experiments of the volatilization of platinum

Year: 1916

Further experiments show that platinum ware in the form of crucibles of whatever degree of purity behaves, with respect to gain or loss of weight, on heating in air at ordinary atmospheric pressure in a manner characteristic only of the temperature of heating. Each impurity, such as Ir, Rh, or Fe, appears to exert its effect on the volatilisation independently, but the loss on heating is negligible below 900 degrees with crucibles of all degrees of purity containing Ir, Rh, Fe, and Si (up to at least 3 % Ir). Below this temperature there may even be a slight gain an weight on heating Pt, owing to the Fe diffusing to the surface and undergoing oxidation, and at higher temperatures the presence of Fe will lower the vo