Phase transition in ABi(4)Ti(4)O(15) (A=Ca,Sr,Ba) Aurivillius oxides prepared through a soft chemical route

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A series of compounds, CaBi4Ti4O15 (CBT), SrBi4Ti4O15 (SBT), and BaBi4Ti4O(15) (BBT), belonging to the Aurivillus-type structure (four layers) has been prepared by a modified chemical route. Different oxalates were precipitated from their respective nitrate solution onto the surface of TiO2 powders. The room temperature x-ray diffraction study reveled that the compounds were having orthorhombic symmetry. Considering the tolerance factor, a significant deformation of the perovskite block is observed and that decreases with increase in ionic radius of A site atom. Temperature dependent dielectric study showed normal ferroelectric to paraelectric transition well above the room temperature except for BBT. The BBT ceramic showed a relaxorlike behavior near phase transition. The quantitative characterization and comparison of relaxor behavior were based on empirical parameters gamma and Delta T-res. The dielectric relaxation rate follows the Vogel-Fulcher relation with activation energy=0.02 eV and freezing temperature=362 degrees C. All these measurements confirmed its relaxorlike phase transition.
Publisher
AMER INST PHYSICS
Issue Date
2009-01
Language
English
Article Type
Article
Keywords

FERROELECTRIC PROPERTIES; DIELECTRIC-PROPERTIES; BISMUTH TITANATE; SINGLE-CRYSTALS; CERAMICS; SRBI4TI4O15; CABI4TI4O15; BA; BABI4TI4O15; COMBUSTION

Citation

JOURNAL OF APPLIED PHYSICS, v.105, no.2

ISSN
0021-8979
DOI
10.1063/1.3068344
URI
http://hdl.handle.net/10203/250934
Appears in Collection
CBE-Journal Papers(저널논문)
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