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Direct Amorphous‐to‐Cubic Perovskite Phase Transformation for Lead Titanate
Author(s) -
Leite E. R.,
Paris E. C.,
Longo E.,
Varela J. A
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01427.x
Subject(s) - lead titanate , perovskite (structure) , high resolution transmission electron microscopy , tetragonal crystal system , materials science , amorphous solid , calcination , transmission electron microscopy , phase (matter) , crystallography , titanate , chemical engineering , mineralogy , analytical chemistry (journal) , crystal structure , nanotechnology , chemistry , ferroelectricity , ceramic , metallurgy , catalysis , biochemistry , optoelectronics , organic chemistry , dielectric , engineering , chromatography
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 PbTiO 3 (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.