High-Pressure Effect on PbTiO3: An Investigation by Raman and X-Ray Scattering up to 63 GPa
Abstract
We report a room-temperature high-pressure x-ray and Raman scattering investigation of lead titanate (PbTiO3) up to 63 GPa. Three continuous phase transitions at 13, 20, and 45 GPa between tetragonal-like phases occur. As a result, no evidence is found for a pressure-induced morphotropic phase boundary. Our study provides experimental evidence that PbTiO3 presents a complex sequence of phases accommodating pressure through mechanisms involving oxygen octahedra tilting and reentrance of ferroelectricity.
- Publication:
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Physical Review Letters
- Pub Date:
- December 2008
- DOI:
- Bibcode:
- 2008PhRvL.101w7601J
- Keywords:
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- 77.80.Bh;
- 62.50.-p;
- 77.84.Dy;
- 78.30.-j;
- Phase transitions and Curie point;
- High-pressure effects in solids and liquids;
- Niobates titanates tantalates PZT ceramics etc.;
- Infrared and Raman spectra