Dielectric properties and relaxor behavior of rare-earth (La, Sm, Eu, Dy, Y) substituted barium zirconium titanate ceramics
- Functional Materials Research Laboratory, Tongji University, Siping Road 1239, Shanghai 200092 (China)
Based on the Ti-vacancy defect compensation model (Ba{sub 1-x}Ln{sub x})Zr{sub 0.2}Ti{sub 0.8-x/4}O{sub 3} (Ln=La,Sm,Eu,Dy,Y) ceramics have been fabricated via the conventional solid-state reaction method. The microstructures, dielectric properties, and ferroelectric relaxor behavior of (Ba{sub 1-x}Ln{sub x})Zr{sub 0.2}Ti{sub 0.8-x/4}O{sub 3} ceramics have been investigated. The results indicate that rare-earth ions with various ionic radii enter the unit cell to substitute for A-site Ba{sup 2+} ions and inhibit the grain growth. The typical ferroelectric relaxor behavior is induced due to the rare-earth ions substitution. The diffuseness of the phase transition and the degree of ferroelectric relaxor behavior are enhanced, the T{sub C} is remarkably shifted to lower temperature, and the tunability is suppressed with the increase of x value and substituted ionic radius for (Ba{sub 1-x}Ln{sub x})Zr{sub 0.2}Ti{sub 0.8-x/4}O{sub 3} (x=0.005-0.04, Ln=La,Sm,Eu,Dy,Y) ceramics. Tunable ferroelectric materials with moderate dielectric constant and low dielectric loss can be obtained by manipulating the doping amount of suitable rare-earth ions.
- OSTI ID:
- 21064415
- Journal Information:
- Journal of Applied Physics, Vol. 102, Issue 8; Other Information: DOI: 10.1063/1.2799081; (c) 2007 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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