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Raposa SM, Tan S, Grundy WM, Lindberg GE, Hanley J, Steckloff JK, Tegler SC, Engle AE, Thieberger CL. Non-Isoplethic Measurement on the Solid-Liquid-Vapor Equilibrium of Binary Mixtures at Cryogenic Temperatures. J Chem Phys 2022; 157:064201. [DOI: 10.1063/5.0097465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
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 (N2/CO) and barely miscible solid solutions (N2/C2H6), as well as mixtures with intermediate solid miscibility (N2/CH4 and CO/CH4). We measured new SLV pressure data for the binary mixtures, except for N2/CH4, which is also available in the literature for verification in this work. While these mixtures are of great interest in planetary science and cryogenics, the resulting pressure data are also needed for modeling purposes. We found the results for N2/CH4 to be consistent with the literature. The resulting new SLV curve for CO/CH4 shows similarities to N2/CH4. Both have two density inversion points (bracketing the temperature range where the solid floats). This result is important for places like Pluto, Triton, and Titan, where these mixtures exist in vapor, liquid, and solid phases. Based on our experiments, the presence of a eutectic is unlikely for the N2/CH4 and CO/CH4 systems. An azeotrope with or without a peritectic is likely, but further investigations are needed to confirm. The N2/CO system does not have a density inversion point, as the ice always sinks in its liquid. For N2/C2H6, new SLV pressure data was measured near each triple point of the pure components.
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Affiliation(s)
- Shaelyn M Raposa
- Astronomy & Planetary Science, Northern Arizona University, United States of America
| | - Sugata Tan
- Planetary Science Institute, United States of America
| | | | | | | | | | | | - Anna E Engle
- Northern Arizona University, United States of America
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Oonk HAJ. The use of the equal-G curve in the interpretation of isobaric binary phase-equilibrium diagrams. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19680871203] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Grieger S, Friedrich H, Asmussen B, Guckelsberger K, Nettling D, Press W, Scherm R. Nuclear spin conversion of methane in pure and rare-gas mixed crystals. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01315649] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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