A complex phase diagram ironuranium

Eutectic features often appear in parts of more complex phase diagrams, as shown in the iron-uranium diagram of Fig. 8.14. If the diagram is divided into three parts at 1/3 and 6/7 mole fraction uranium, the result is two simple eutectic diagrams and a more complex diagram.

The Fe-rich side resembles Fig. 8.11 with two added features. The first is the number of phases of the pure components. The left hand ordinate of Fig. 8.14 makes provision for three crystallographic modifications of iron: The a phase (designated as aFe) is stable up to 912oC; yFe exists in the range 912 < T < 1394oC; the SFe phase is the equilibrium form from 1394oC to the melting point. The aFe/yFe and the yFe/SFe transitions are indicated by horizontal lines at 912 and 1394oC. Uranium is completely insoluble in all three crystal forms of iron. The eutectic point is at 17 mole percent uranium and 1080oC.

The other feature that distinguishes the Fe-rich portion of the iron-uranium phase diagram from the gold-silicon diagram of Fig. 8.11 is the right hand border at xU = 0.333. In the Au-Si system, the eutectic is bounded on the right by pure Si. The left-hand eutectic portion of the Fe-U diagram, on the other hand, has an intermetallic compound,

Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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