期刊
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
卷 42, 期 2, 页码 173-179出版社
SPRINGER
DOI: 10.1007/s10971-007-1554-6
关键词
chemical synthesis; BCT nanopowders; BaTiO3; pechini
In this work, we have studied the, influence of the pH on the synthesis and structural properties of the Ba0.77Ca0.23TiO3 nanopowders synthesized by a modified polymeric precursor method, in order to achieve non-agglomerated powders. Synthesis, morphology, thermal reactions, crystallite and average particle size of the synthesized powders were investigated through thermal analysis (DTA/TG), X-ray diffraction (XRD), field emission scanning.),and Infrared spectroscopy. In electron microscope (FE-SEM) summary, Ba0.77Ca0.23TiO3 nanopowders were synthesized for the first time at a relative low temperature (500 degrees C). It was also found that the alkalinity and acidity of the solution presented a great influence on the powder properties. The best results were obtained from solutions with pH = 8.5 and 11 whose nanopowders presented weakly agglomerate, with homogeneous particle size and a narrow size distribution (30-40 nm). This behavior could be explained based on the FT-IR results in which it was possible to see the increased of the chelation in higher pHs.
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