Non-isoplethic measurement on the solid-liquid-vapor equilibrium of binary mixtures at cryogenic temperatures.

We measured the solid-liquid-vapor (SLV) equilibrium of binary mixtures during experiments that alternated between cooling the mixture and injecting the more-volatile component into the sample chamber; thus, the composition of the mixture changed (non-isoplethic) throughout the experiment. Four binary mixtures were used in the experiments to represent mixtures with miscible solid phases (N/CO) and barely miscible solid solutions (N/CH), as well as mixtures with intermediate solid miscibility (N/CH and CO/CH). We measured new SLV pressure data for the binary mixtures, except for N/CH, which are also available in the literature for verification in this work.