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Structural and dielectric properties of ferroelectric Sr1−xBaxBi2(Nb0.5Ta0.5)2O9 and Sr0.5Ba0.5Bi2(Nb1−yTay)2O9 ceramics
- Source :
-
Materials Research Bulletin . Jan2003, Vol. 38 Issue 2, p195. 12p. - Publication Year :
- 2003
-
Abstract
- Ferroelectric Sr1−xBaxBi2(Nb0.5Ta0.5)2O9 and Sr0.5Ba0.5Bi2(Nb1−yTay)2O9 were synthesized by solid state reaction route. X-ray diffraction studies confirm the formation of single phase layered perovskite solid solutions over a wide range of compositions (<F>x=y=0.0</F>, 0.25, 0.50, 0.75 and 1). The lattice parameters and the Curie temperature (Tc) have been found to have linear dependence on x and y. Transmission electron microscopy (TEM) suggest the lowering of orthorhombic distortion with increasing Ba2+ substitution. Variations in microstructural features as a function of x and y were monitored by scanning electron microscopy (SEM). The dielectric constant at room temperature increases with increase in both x and y. Interestingly Ba2+ substitution on Sr2+ site induces diffused phase transition and diffuseness increases with increasing Ba2+ concentration. [Copyright &y& Elsevier]
- Subjects :
- *CHEMICAL structure
*DIELECTRICS
*FERROELECTRICITY
*SOLID solutions
Subjects
Details
- Language :
- English
- ISSN :
- 00255408
- Volume :
- 38
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Materials Research Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 9008312
- Full Text :
- https://doi.org/10.1016/S0025-5408(02)01049-8