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Figure 4 Definition of various temperatures. T0 is the temperature at which the two phases are in thermodynamic equilibrium. TH is the temperature at which the transition in a particular crystal (or sample) begins on heating; TL is the corresponding value for cooling; |TH - T0| < |T0 - TL|. The fraction transformed on heating is shown by the full curve AE on the right; the analogous curve for cooling is GD (broken line) on the left. `TC' is the `transition temperature' recorded by DSC in a heating run. The schematic hysteresis loop DAEGD should be compared with the experimental loop for single-crystal NH4Cl determined by Dinichert (1942; see Fig. 7b). Adapted from Fig. 2.31 of Mnyukh (2001).

© International Union of Crystallography 2006