Figure 4
From: Pressure-induced reversal between thermal contraction and expansion in ferroelectric PbTiO3
(a) A schematic illustration of crystal structure for tetragonal PbTiO3 showing the alternative Pb-OII and Ti-OI bonds along the c axis. (4b), variation of short and long Pb-OII bond lengths as functions of temperature and pressure. Similar bond equalization tendency is also observed in Ti-OI bonds. The solid lines are drawn from linear fitting to guide eyes.
