High-pressure x-ray diffraction study of Pb(Mg$_{1/3}$Nb$_{2/3})$O$_{3}$-32{\%}PbTiO$_{3}$.

Motivated to determine and understand PMN-32{\%}PT's behavior under pressure, we employed the angular dispersive x-ray diffraction methods (Advanced Photon Source, Argonne National Laboratory) to investigate PMN-32{\%}PT in a diamond anvil cell up to 15 GPa. The x-ray diffraction results show changes in Bragg peaks at 4 GPa which indicate that PMN-32{\%}PT undergoes a ferroelectric rhombohedral to a paraelectric cubic phase transition. In addition, we investigated the pressure dependence of domain structure of PMN-32{\%}PT up to 10 GPa; rhombohedral domains decrease with pressure and disappear above 4 GPa. These results are qualitatively consistent with earlier Raman study of B. Chaabane, {\{}Phys. Rev. B 70, 134114, 2004{\}}. We suggest a phase diagram for PMN-PT system which is slightly different from the one predicted by B. Chaabane et al.