Structural and dielectric properties of ferroelectric Sr{sub 1-x}Ba{sub x}Bi{sub 2}(Nb{sub 0.5}Ta{sub 0.5}){sub 2}O{sub 9} and Sr{sub 0.5}Ba{sub 0.5}Bi{sub 2}(Nb{sub 1-y}Ta{sub y}){sub 2}O{sub 9} ceramics
Ferroelectric Sr{sub 1-x}Ba{sub x}Bi{sub 2}(Nb{sub 0.5}Ta{sub 0.5}){sub 2}O{sub 9} and Sr{sub 0.5}Ba{sub 0.5}Bi{sub 2}(Nb{sub 1-y}Ta{sub y}){sub 2}O{sub 9} 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 (x=y=0.0, 0.25, 0.50, 0.75 and 1). The lattice parameters and the Curie temperature (T{sub c}) have been found to have linear dependence on x and y. Transmission electron microscopy (TEM) suggest the lowering of orthorhombic distortion with increasing Ba{sup 2+} 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 Ba{sup 2+} substitution on Sr{sup 2+} site induces diffused phase transition and diffuseness increases with increasing Ba{sup 2+} concentration.
- OSTI ID:
- 20884632
- Journal Information:
- Materials Research Bulletin, Vol. 38, Issue 2; Other Information: DOI: 10.1016/S0025-5408(02)01049-8; PII: S0025540802010498; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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