Pressure-induced transitions in ferroelectric single-crystal PbZr 0.54 Ti 0.46 O 3

Pressure-induced transitions in ferroelectric single-crystal PbZr_0.54Ti_0.46O₃

Muhetaer Aihaiti ¹, Maddury Somayazulu ¹, Dmitry Popov ², Yujuan Xie ³, Xifa Long ³, Zuo-Guang Ye ³, Ronald E. Cohen ^{1, 4}, Russell J. Hemley ⁵

¹ Geophysical Laboratory, Carnegie Institution of Washington, Washington DC, United States
² HPCAT, Geophysical Laboratory, Carnegie Institution of Washington,, Argonne, United States
³ Department of Chemistry and 4D LABS, Simon Fraser University,, Burnaby, Canada
⁴ Department of Earth and Environmental Sciences, Ludwig Maximilians Universität, Munich, Germany
⁵ Department of Civil and Environment Engineering, The George Washington University, Washington DC 20052, USA, Washington DC, United States

Pressure-induced phase transitions in single-crystal PbZr_0.54Ti_0.46O₃ are investigated with high-pressure Raman scattering and x-ray single crystal and powder diffractions. Appearance of a Raman peak near 380 cm⁻¹ indicates a structural transition at 3 GPa. A second transition, driven by an optical soft phonon, occurs at 9 GPa. A third transition occurs above 27 GPa, accompanied by a large changes in the Raman spectra and a concomitant splitting of the (pseudo-cubic) (111) and (220) diffraction lines. We identify the transitions as a monoclinic (Cm) to rhombohedral transition (R3m) at 3 GPa, followed by a rhombohedral (R3m) to rhombohedral (R-3c) transition at 9 GPa, and a further symmetry-lowering transition at 27 GPa.

Reference:

Th-S66-O-02

Presenter/s:

Muhetaer Aihaiti

Presentation type:

Oral communication

Room:

Room1

Chair/s:

Antoni Planes

Date:

Thursday, September 7th, 2017

Time:

11:30 - 11:45

Session times:

11:15 - 12:30

IMF2017