Question: Magnesium oxide and nickel oxide withstand high temperatures. However, they do melt when the temperature is high enough and the behaviour of mixtures of the

Magnesium oxide and nickel oxide withstand high temperatures. However, they do melt when the temperature is high enough and the behaviour of mixtures of the two is of considerable interest to the ceramics industry. Draw the temperature-composition diagram for the system using the data below, where x is the mole fraction of MgO in the solid and y its mole fraction in the liquid.
O/oC 1960 2200 2400 2600 2800
x 0 0.35 0.60 0.83 1.00
y 0 0.18 0.38 0.65 1.00
State
(a) The melting point of a mixture with x =0.30,
(b) The composition and proportion of the phases present when a solid of composition x = 0.30 is heated to 2200°C,
(c) The temperature at which a liquid of composition y = 0.70 will begin to solidify.

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