Figure 3
From: Pressure-induced reversal between thermal contraction and expansion in ferroelectric PbTiO3
(a) A Evolution of lattice parameters a and c of tetragonal PbTiO3 with increasing pressure at 300 K, 480 K, 580 K and 730 K. (3b), tetragonality (c/a) of PbTiO3 as functions of temperature and pressure. The solid lines are drawn from linear fitting and the determined pressure derivatives, d(c/a)/dP, are −0.013(2)/GPa, −0.0057(15)/GPa, −0.0039(16)/GPa and −0.00048(107)/GPa for 300 K, 480 K, 580 K and 730 K, respectively.
