Figure 2
Lattice parameters and unit-cell volume of TDP as a function of temperature: (a) lattice parameter a; (b) lattice parameter b; (c) lattice parameter c; (d) lattice parameter ; (e) lattice parameter ; (f) lattice parameter and order parameter η; (g) volume of the unit cell. The solid lines in (a)–(e) and (g) are guides to the eye, the solid line in (f) is calculated with an exponent = 0.255 (3) and the dashed curve with = 0.5. |