Abstract
The titanium-rich PZT solid solution PbZr 0.20Ti 0.80O 3 was studied under high pressure by X-ray diffraction and Raman spectroscopy. A series of low-symmetry phases were observed, including monoclinic (space groups Cm and Cc) and triclinic forms (space groups F1 and F 1 ¯ ) in PbZr 0.20Ti 0.80O 3. High pressure Raman spectra obtained are consistent with a monoclinic ( Cc)–triclinic ( F1) phase transition involving a soft mode at 9 GPa, in agreement with the change in compressibility detected by X-ray diffraction. The strong Raman spectra observed in the paraelectric phase can also be explained by the triclinic F 1 ¯ symmetry.
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