Phase Diagram of Argon—Carbon Monoxide

Publisher Website
Google Scholar
Abstract
The phase diagram Ar–CO has been determined by cooling curves and x‐ray diffraction. Like the Ar–N2 system, a solid solution of hcp structure extends over essentially the entire range of concentration at temperatures just under the solidus, but unlike the Ar–N2 system, the hcp phase decomposes (eutectoidally) into a fcc Ar‐rich phase and a primitive cubic CO‐rich phase at 53°K; the eutectoid point is at 66% CO. The miscibility gap at 53°K extends from 5% to 85% CO and is probably complete at 0°K. There are quite extensive two‐phase regions between the phases in the solid state, which were not found in the Ar–N2 system. There is again an indication that Ar would have the hcp structure just a few degrees above the melting point if melting did not intervene. Liquidus and solidus temperatures for Ar–CO reach a minimum (65°K) near 60%—70% CO. Lattice constants for the different phases are presented.

This publication has 7 references indexed in Scilit: