Temperature-composition phase diagrams solid-liquid with compounds

Sketch the solid-liquid and liquid-vapor temperature-composition phase diagram of titanium and uranium. The two substances form a nearly ideal liquid solution with a uranium boiling temperature of 1133°C and a titanium boiling temperature of 1660°C. The melting temperature of uranium is 770°C, and that of titanium is 882°C. There is a compound, TiUa, which melts at 890°C. The eutectic between the compound and uranium is at uranium mole fraction 0.95 and 720°C, and the eutectic between titanium and the compound is at uranium mole fraction 0.28 and 655°C. Label each area with the number of independent intensive variables. ... 

Partial Miscibility in the Solid State So far, we have described (solid + liquid) phase equilibrium systems in which the solid phase that crystallizes is a pure compound, either as one of the original components or as a molecular addition compound. Sometimes solid solutions crystallize from solution instead of pure substances, and, depending on the system, the solubility can vary from small to complete miscibility over the entire range of concentration. Figure 14.26 shows the phase diagram for the (silver + copper) system.22 It is one in which limited solubility occurs in the solid state. Line AE is the (solid -I- liquid) equilibrium line for Ag, but the solid that crystallizes from solution is not pure Ag. Instead it is a solid solution with composition given by line AC. If a liquid with composition and temperature given by point a is... 

Figure 8.9. Phase diagram of a two-component system without mutual solubility or compound formation. A liquid mixture of concentration will deposit solid phase A when cooled to temperature Tj. A liquid mixture with the eutectic concentration can be directionally solidified to a laminar crystalline 2-2 composite of phases A and B if the eutectic temperature is not too low.

The main features of the phase diagrams of intra-thorium, -uranium and -plutonium phase diagrams have also been presented in figs. 64-66. The uranium-thorium phase diagram exhibits a miscibility gap in the liquid state. The plutonium-thorium phase diagram is more complex, with the two elements miscible in the liquid state in the A2-solid solution a small miscibility gap is observed, however a compound at composition PuyTha appears at low temperature. 

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