Abstract
Lead-free ceramics 0.50Ba0.9Ca0.1TiO3–0.50BaTi1−x Zr x O3 (BCT–BZT) were prepared via sintering BCT and BZT nanoparticles, which were synthesized using a modified Pechini polymeric precursor method, at a low temperature of 1260°C. The relative densities of the ceramics prepared with different zirconium contents (x) were all above 95.3%, reaching a maximum of 97% when x = 0.08. X-ray diffraction results confirmed the onset of phase transformation from orthorhombic to rhombohedral symmetry with increasing zirconium contents, and the polymorphic phase transition was observed at x = 0.10. The dielectric dispersion, diffuse phase transition (DPT), and relaxor-like ferroelectric characteristics as a function of zirconium content were thoroughly studied. Optimum physical properties, remnant polarization (P r) = 16.4 μC/cm2, piezoelectric constant (d 33) = ~240 pC/N, and electromechanical coupling factor (k p) = 0.22, were obtained at x = 0.10. The findings of the current DPT behavior study of BCT–BZT ceramics are believed to be insightful to the development of ferroelectric materials.
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Acknowledgements
The authors would like to thank the Fundamental Research Funds for National University (CUG120 118), Innovation Program of China University of Geosciences (No. 201310491013), and State Key Laboratory of Advanced Technology for Materials Synthesis Processing (Wuhan University of Technology, 2012-KF-3) for their financial support.
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Tian, Y., Gong, Y., Meng, D. et al. Dielectric Dispersion, Diffuse Phase Transition, and Electrical Properties of BCT–BZT Ceramics Sintered at a Low-Temperature. J. Electron. Mater. 44, 2890–2897 (2015). https://doi.org/10.1007/s11664-015-3727-3
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DOI: https://doi.org/10.1007/s11664-015-3727-3