Then, the total Gibbs energy of the system 𝐺 is calculated according to eq. ( ). The target parameter Δ 𝐺° ⋅ (𝑇), which is the only unknown in the system, is fitted in a way that 𝐺 is minimal at the calculated equilibrium composition, i.e. 𝜉 , . This procedure is repeated for six temperatures (details see SI). With the obtained results, a function of