Determination of oxygen in powders of refractory phosphides and phosphorus-containing alloys by the reduction extraction method

The conditions of determination of oxygen content in powders of different r efractory phosphides phosphorus-containing alloys have been studied by the reduction extraction method. Phosphides of the second classification group and copper phosphides with a limited oxygen concentration have the least ab ility to sublimate the phosphorus under the analysis conditions. The use of metal flux, particular nickel, results in a satisfactory decrease in subli mate quantity. The reliability of results obtained has been checked through the method of additives and variation of weighted amounts The metrological characteristics of measurements of oxygen mass fraction in the studied mat erials have been determined. The measuring errors follow the up-to-date sta ndards for metal powders.