High temperature dielectric, ferroelectric and piezoelectric properties of Mn-modified BiFeO3-BaTiO3 lead-free ceramics

Lead-free and high-temperature 0.71BiFeO 3 -0.29BaTiO 3 ceramics with Mn modification (BF-BT- x  %Mn) were fabricated by conventional solid-state reaction method, and the high temperature dielectric, ferroelectric and piezoelectric properties were investigated. All compositions exhibited pseudo-cubi...

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Bibliographic Details
Published in:Journal of materials science 2017, Vol.52 (1), p.229-237
Main Authors: Li, Qiang, Wei, Jianxin, Cheng, Jinrong, Chen, Jianguo
Format: Article
Language:English
Subjects:
Barium titanates
Bismuth compounds
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Coercivity
Crystallography and Scattering Methods
Curie temperature
Depolarization
Dielectric loss
Dielectric properties
Electrical properties
Ferroelectric materials
Ferroelectricity
High temperature
Lead free
Materials Science
Original Paper
Permittivity
Piezoelectricity
Polymer Sciences
Solid Mechanics
Solid solutions
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Summary:Lead-free and high-temperature 0.71BiFeO 3 -0.29BaTiO 3 ceramics with Mn modification (BF-BT- x  %Mn) were fabricated by conventional solid-state reaction method, and the high temperature dielectric, ferroelectric and piezoelectric properties were investigated. All compositions exhibited pseudo-cubic phases. Mn modification improved the electrical properties of BF-BT solid solutions at both room and high temperature. The Curie temperature T C , depolarization temperature T d , dielectric constant ε r , dielectric loss tanδ , piezoelectric constant d 33 , electromechanical coupling factor k p , remnant polarization P r of BF-BT-1.2 %Mn ceramics were 506, 500 °C, 556, 0.04, 169 pC N −1 , 0.373, 31.4 μC cm −2 , respectively. The ε r , tanδ, and k p of BF-BT-1.2 %Mn ceramics were stable with the increase of temperature until 500 °C. The coercive field E c of BF-BT-1.2 %Mn ceramics was nearly 30 kV cm −1 at 200 °C, which was much larger than those of PZT, BS-PT,BNT and KNN ceramics. The high field strain coefficient d * 33 reached as large as 525 pm V −1 at 200 °C. These results showed that the BF-BT- x  %Mn ceramics were promising candidate for high temperature piezoelectric applications.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-016-0325-6