Morphotropic phase boundary in the BNT–BT–BKT system

Lead-free x Bi0.5Na0.5TiO3–y BaTiO3–z Bi0.5K0.5TiO3 piezoelectric ceramics were synthesized by a conventional solid state reaction method. The microstructure, ferroelectric and piezoelectric properties of the ceramics were investigated. Structure measurements by X-ray diffraction with Rietveld refin...

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Bibliographic Details
Published in:Ceramics international 2012-05, Vol.38 (4), p.2823-2827
Main Authors: Trelcat, Jean-François, Courtois, Christian, Rguiti, Mohamed, Leriche, Anne, Duvigneaud, Paul-Henri, Segato, Tiriana
Format: Article
Language:English
Subjects:
Barium titanate
Bismuth potassium titanate
Bismuth sodium titanate
BOUNDARIES
C. Electrical properties
C. Piezoelectric properties
CERAMICS
Chemical Sciences
Ferroelectric materials
JOINING
Lead-free
Material chemistry
Microstructure
MICROSTRUCTURES
Morphotropic phase boundary
PHASE BOUNDARIES
PHASES
Piezoelectric ceramics
Piezoelectricity
SOLID SOLUTIONS
Solid state reaction
YTTRIUM OXIDE
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Summary:Lead-free x Bi0.5Na0.5TiO3–y BaTiO3–z Bi0.5K0.5TiO3 piezoelectric ceramics were synthesized by a conventional solid state reaction method. The microstructure, ferroelectric and piezoelectric properties of the ceramics were investigated. Structure measurements by X-ray diffraction with Rietveld refinement have allowed us to specify more precisely the morphotropic phase boundary (MPB) in this system. For (1−x) BNT–x BT solid solution ceramics, the 0.94 BNT–0.06 BT morphotropic composition shows the higher values with d33=170pC/N, kp=0.35 and kt=0.53. In the case of (1−x) BNT–x BKT compositions, the d33, kp and kt are, respectively, 137pC/N, 0.39 and 0.54 for the 0.80 BNT–0.20 BKT ceramic. On the other hand, the ternary 0.865 BNT–0.035 BT–0.100 BKT morphotropic composition shows high piezoelectric constant and electromechanical coupling factors (d33=133pC/N, kp=0.26 and kt=0.57).
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2011.11.053