Open AccessSynthesis and characterization of Ce and La modified bismuth titanate
Author(s) -
Nikolina Pavlović,
Dejan Kancko,
Mészáros Katalin Szécsényi,
Vladimir V. Srdić
Publication year - 2009
Publication title -
processing and application of ceramics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.326
H-Index - 15
eISSN - 2406-1034
pISSN - 1820-6131
DOI - 10.2298/pac0902088p
Subject(s) - pyrochlore , materials science , aurivillius , bismuth titanate , bismuth , titanate , lanthanum , calcination , cerium , phase (matter) , ceramic , chemical engineering , mineralogy , inorganic chemistry , metallurgy , ferroelectricity , dielectric , chemistry , organic chemistry , optoelectronics , engineering , catalysis
Bismuth titanate based nanopowders with the different content of La or Ce were synthesized by the modified sol-gel method. After calcination at 600?C, in addition to Aurivillius layered structure, a small quantity of cubic pyrochlore phase was detected in the La modified powders, while this second phase was much more pronounced in the Ce substituted powders. In fact, as the powder with the highest amount of Ce (Bi3CeTi3O12) has the pure pyrochlore phase it seems that the presence of Ce stabilizes the formation of this phase. This different influence of cerium and lanthanum could be explained by the incorporation of their ions on the different sites in the titanate structure. Bismuth titanate based ceramics, sintered at 1050?C/2h, had densities above 93% of theoretical density and characteristic plate-like grain morphology. Small quantity of cubic pyrochlore phase was detected only in the Ce modified bismuth titanate ceramics. On the other hand, lanthanum addition caused formation of smaller grain size with pronounced plate-like morphology. .