Uranium tetrafluoride and zirconium tetrafluoride melt at 1035C and 912C, respectively

Chapter 6, Problem 6.14(b)

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Uranium tetrafluoride and zirconium tetrafluoride melt at 1035C and 912C, respectively. They form a continuous series of solid solutions with a minimum melting temperature of 765C and composition x(ZrF4) = 0.77. At 900C, the liquid solution of composition x(ZrF4) = 0.28 is in equilibrium with a solid solution of composition x(ZrF4) = 0.14. At 850C the two compositions are 0.87 and 0.90, respectively. Sketch the phase diagram for this system and state what is observed when a liquid of composition x(ZrF4) = 0.40 is cooled slowly from 900C to 500C.

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