Nickel oxide and magnesium oxide with stand high temperatures. However, they do melt when the temperature is high enough and the behavior of mixtures of the two is of considerable interest to the ceramics industry. Illustrate 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.
θ/ ?C 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
1. Demonstrate the melting point of a mixture with x=0.30
2. Why the composition and proportion of the phases present when a solid of composition x=0.30 is heated to 2200 degrees Celsius.
3. Determine the temperate at which a liquid of composition y=0.70 will begin to solidify.