Mass spectrographic study of solid iron–cobalt alloys

Abstract

The activities of iron and cobalt in face-centred cubic iron-cobalt alloys have been determined using a Knudsen Cell and double-focussing mass spectrometer. Difficulties due to changes in the absolute sensitivity of the mass spectrometer were overcome by making measurements of the ratio of the intensities I(⁵⁶Fe⁺)/I(⁵⁹Co⁺) using an analysis developed by Belton and Fruehan. Activities at 1 500 K approximately obey Raoult's law and are in excellent agreement with previous work.