Artigo
Direct amorphous-to-cubic perovskite phase transformation for lead titanate
Fecha
2000-01-01Registro en:
Journal of the American Ceramic Society, v. 83, n. 6, p. 1539-1541, 2000.
0002-7820
10.1111/j.1151-2916.2000.tb01427.x
2-s2.0-0033686948
Autor
Universidade Federal de São Carlos (UFSCar)
Universidade Estadual Paulista (Unesp)
Resumen
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.