Pressure-induced phase transitions in Zr-rich PbZr1-xTixO3 ceramics
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Data
2001-08-20
Autores
Souza Filho, A. G.
Faria, J. L B
Freire, P. T C
Ayala, A. P.
Sasaki, J. M.
Melo, F. E A
Mendes Filho, J.
Araújo, E. B. [UNESP]
Eiras, J. A.
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Resumo
A Raman study of structural changes in the Zr-rich PbZr1-x TixO3 (PZT) system under hydrostatic pressures up to 5.0 GPa is presented. We observe that externally applied pressure induces several phase transitions in PZT ceramics among phases with orthorhombic (Ao), rhombohedral low-temperature (RLT), and rhombohedral high-temperature (RHT) symmetries (all found in PZT at ambient pressure and room temperature). Each of the compositions investigated (0.02 ≤ x ≤ 0.14) exhibits a high-pressure phase with orthorhombic (OI′) symmetry. We further report a detailed study of the pressure dependence of Raman frequencies to elucidate the phase transitions and to provide a set of pressure coefficients for the high-pressure phases.
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Hydrostatic pressure, Lead compounds, Phase diagrams, Phase transitions, Raman spectroscopy, Thermal effects, Zirconium, Lead titanate zirconate (PZT), Ceramic materials
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Journal of Physics Condensed Matter, v. 13, n. 33, p. 7305-7314, 2001.