Binary phase diagrams interpretation

Data for the hydrogen sulfide-water and the methane-n-hexane binary systems were considered. The first is a type III system in the binary phase diagram classification scheme of van Konynenburg and Scott. Experimental data from Selleck et al. (1952) were used. Carroll and Mather (1989a b) presented a new interpretation of these data and also new three phase data. In this work, only those VLE data from Selleck et al. (1952) that are consistent with the new data were used. Data for the methane-n-hexane system are available from Poston and McKetta (1966) and Lin et al. (1977). This is a type V system. 

Interpreting the Phases and Compositions in a Binary Phase Diagram as Described by the Lever Rule Alloy Compositions in a Solid Solution with Limited Solubility Determine the composition, relative amonnts, and phases present at point B on Figure 23.7. Alloy Compositions in a Solid Solution with Limited Solubility Determine the composition, relative amonnts, and phases present at point C on Figure 23.7. 

THE INTERPRETATION OF GEOLOGICAL PHASE DIAGRAMS, Ernest G. Ehlers. Clear, concise text emphasizes diagrams of systems under fluid or containing pressure also coverage of complex binary systems, hydrothermal melting, more. 288pp. 6X x 9X. 65389-7 Pa. 8.95... 

Phase diagrams for multicomponent mixtures possess additional degrees of freedom and are inherently multidimensional. In practice, construction and interpretation of phase diagrams of multicomponent mixtures are similar to, and based on, those of binary mixtures. " " The phase behavior of multicomponent mixtures can also be depicted as sections in PTxiX2-space, keeping one or more of the variables constant. A widely used section for ternary mixtures is an equilateral triangle composition diagram at fixed pressure and temperature (Fig. 7). 

Solid-fluid phase diagrams of binary hard sphere mixtures have been studied quite extensively using MC simulations. Kranendonk and Frenkel [202-205] and Kofke [206] have studied the solid-fluid equilibrium for binary hard sphere mixtures for the case of substitutionally disordered solid solutions. Several interesting features emerge from these studies. Azeotropy and solid-solid immiscibility appear very quickly in the phase diagram as the size ratio is changed from unity. This is primarily a consequence of the nonideality in the solid phase. Another aspect of these results concerns the empirical Hume-Rothery rule, developed in the context of metal alloy phase equilibrium, that mixtures of spherical molecules with diameter ratios below about 0.85 should exhibit only limited solubility in the solid phase [207]. The simulation results for hard sphere tend to be consistent with this rule. However, it should be noted that the Hume-Rothery rule was formulated in terms of the ratio of nearest neighbor distances in the pure metals rather than hard sphere diameters. Thus, this observation should be interpreted as an indication that molecular size effects are important in metal alloy equilibria rather than as a quantitative confirmation of the Hume-Rothery rule. 

Analogous to ternary systems, a quaternary system can be represented in a three-dimensional prism, but having a square as prism base with the four components at the comers. An example is given in Figure 3.6a for four arbitrary components A, B, C, and D. Again, only simple eutectic binary systems A/B, B/C, C/D, and A/D are assumed. In order to simplify the interpretation of such quaternary phase equilibria, as for ternary systems, usually isothermal slices of the three-dimensional representation of the phase diagram are considered. 

Phase diagrams have been experimentally determined for many ceramic systems. For binary or two-component phase diagrams, it is frequently the case that the two components are compounds that share a common element, often oxygen. These diagrams may have configurations similar to those for metal-metal systems, and they are interpreted in the same way. For a review of the interpretation of phase diagrams, the reader is referred to Section 9.8. 

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