Figure 3: Thermodynamic properties of stripe-type-λ-Ti3O5 and pressure-produced β-Ti3O5.
From: External stimulation-controllable heat-storage ceramics
(a) Molar heat capacity of λ-Ti3O5 (blue) and β-Ti3O5 (red) as a function of temperature. Experimental data were fitted with a Debye model (see Methods). (b) DSC charts of the pressure-produced β-Ti3O5 with increasing temperature and λ-Ti3O5 with decreasing temperature. A peak due to the latent heat of the first-order phase transition from β-Ti3O5 to λ-Ti3O5 (230 kJ L−1) was observed in the heating process, whereas no peak was observed in the cooling process. (c) Temperature dependence of the enthalpy (H) for λ-Ti3O5 (blue) and β-Ti3O5 (red). When pressure is applied to λ-Ti3O5, the accumulated heat energy is released as shown in the lower enlarged figure (see Supplementary Movie 3). (d) Pressure-released heat energy accompanying the pressure-induced phase transition from stripe-type-λ-Ti3O5 to β-Ti3O5. Pressure was applied at t=0.
