The entropy versus temperature plot for phases α and ß at 1 bar pressure is given.
S_T and S₀ are entropies of the phases at temperatures T and 0 K, respectively.

The transition temperature for α to ß phase change is 600 K and C_p,ß – C_p,α = 1 J mol^–1 K^–1. Assume (C_p,α – C_p,ß) is independent of temperature in the range of 200 to 700 K. C_p,α and C_p,ß are heat capacities of α and ß phases, respectively.