A P€“T phase diagram for potassium is shown below.

a. Which phase has the higher density, the fcc or the bcc phase? Explain your answer.

b. Indicate the range of P and T in the phase diagram for which fcc and liquid potassium are in equilibrium. Does fcc potassium float on or sink in liquid potassium? Explain your answer.

c. Redraw this diagram for a different pressure range and indicate where you expect to find the vapor phase. Explain how you chose the slope of your liquid€“vapor coexistence line.

Transcribed Image Text:

16 POTASSIUM fcc (II) 12 8 Liquid bcc (I) 400 600 800 200 T/K P/GPa 4+