Direct amorphous-to-cubic perovskite phase transformation for lead titanate
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Data
2000-01-01
Autores
Leite, E. R.
Paris, E. C.
Longo, Elson [UNESP]
Varela, José Arana [UNESP]
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Resumo
The phase evolution of lead titanate processed by the polymeric precursor method was investigated by thermal analysis, X-ray diffraction, and high-resolution transmission electron microscopy. The results showed that the cubic perovskite PbTiO3 (PT) phase is formed from an inorganic amorphous precursor at a temperature of 444 °C. A gradual transition from cubic to tetragonal perovskite PT was observed with the increase of calcination time at this temperature. HRTEM results showed that the cubic PT particles have a size of around 5 nm. The identification of cubic PT as an intermediate phase supports the hypothesis that the chemical homogeneity was kept at the molecular level during the synthesis process, with no cation segregation.
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Palavras-chave
Amorphous materials, Calcination, Ceramic materials, Ferroelectric materials, High resolution electron microscopy, High temperature effects, Particle size analysis, Perovskite, Phase transitions, Thermoanalysis, Transmission electron microscopy, X ray crystallography, Lead titanate, Lead compounds
Como citar
Journal of the American Ceramic Society, v. 83, n. 6, p. 1539-1541, 2000.