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Dielectric and ferroelectric properties of Ba0.97-xCaxLa0.03Ti0.9Sn0.1O3 lead-free ceramics.
- Source :
-
Journal of Alloys & Compounds . May2017, Vol. 704, p141-145. 5p. - Publication Year :
- 2017
-
Abstract
- The Ba 0.97-x Ca x La 0.03 Ti 0.90 Sn 0.10 O 3 (x = 0.02–0.10) lead-free piezoelectric ceramics were fabricated via conventional solid-state sintering process at 1480 °C. The effects of Ca 2+ ions substitution on microstructure and electrical properties of the ceramics were researched. Ca 2+ ions substitute for A-site Ba 2+ ions to enter the unit cell maintaining the perovskite structure of th solid solution and the orthorhombic phase and tetragonal phase coexist in the composition with x = 0.04 to 0.10. SEM images confirmed the inhibiting effect of Ca ions on the grain growth process of the Ba 0.97-x Ca x La 0.03 Ti 0.90 Sn 0.10 O 3 ceramics. Uniformly distributed microstructures with high relative densities above 94.71% were developed with the further addition of Ca 2+ ions. Main piezoelectric parameters were optimized at x = 0.04 with a high piezoelectric coefficient (d 33 = 541 pC/N), a planar electromechanical coupling factor (k p = 45.7%), The analysis on the temperature dependence of dielectric permittivity approved the existence of the mixed ferroelectric-relaxor features in all the BCLST samples. The remnant polarization (Pr) reaches an extreme value of 7.81 μC/cm 2 at x = 0.08. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 704
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 121672273
- Full Text :
- https://doi.org/10.1016/j.jallcom.2017.01.271