图9. MTP模型在固-固相变中的应用^[111~113]

Fig.9. Applications of MTP model on solid-solid phase transitions
(a) lego-like metastable phases in Ti₃O₅^[111] (c and a—lattice constants)
(b) free energy as a function of collective variables during \beta-\lambda phase transition in Ti₃O₅^[111] (The dashed line denotes the PES for a concerted β-λ phase transition, whereas the solid line represents the PES for the transition pathway via intermediate metastable phases)
(c) phase diagram of In₂Se₃^[112]
(d) domain wall configurations in \beta \text{'}-2H In₂Se₃ phase^[112] (t—time)
(e) vibrational, orientational, and total entropy of low-temperature monoclinic (M-I), intermediate-temperature monoclinic (M-II), fcc (C), and high-pressure rhombohedral (R) phases of KPF₆ as a function of temperature^[113] (S_ori—orientational contribution, S_vib—vibrational contribution, S_tot—total contribution)