Raman and dielectric study of Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3}-MgAl{sub 2}O{sub 4} tunable microwave composite
- Functional Materials Research Laboratory, Tongji University, 1239 Siping Road, Shanghai 200092 (China)
(1-x)Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3}-xMgAl{sub 2}O{sub 4} (x=0.00, 0.05, 0.10, 0.20, and 0.30) composite ceramics have been synthesized by the solid-state reaction, and its structural and dielectric properties have been systematically characterized. Two crystalline phases, a cubic perovskite structure Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} (BST) and a face-centered-cubic spinel structure MgAl{sub 2}O{sub 4} (MA), are clearly visible for x{>=}0.05. As the MA content increases, the composite ceramics show an increased degree of deviation from the Curie-Weiss law and an increased diffuseness of the dielectric peak. Meanwhile, the tunability of composite ceramics increases. Raman analysis clearly indicates that the incorporation of MA lowers the permittivity and degrades the quality factor of BST composites, which is ascribed to the deterioration on B-site ordering of ABO{sub 3} perovskite structure.
- OSTI ID:
- 21185872
- Journal Information:
- Journal of Applied Physics, Vol. 104, Issue 8; Other Information: DOI: 10.1063/1.3000057; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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