Structure and dielectric property of Zr-doped (Na0.47Bi0.46Ba0.06K0.01)(Nb0.02Ti0.98)O3 lead-free ceramics
(Na0.47Bi0.46Ba0.06K0.01)(Nb0.02Ti0.98-xZrx)O3 lead-free ceramics (BNBKT-xZr, x = 0, 0.01, 0.02, 0.04) were synthesized via conventional solid state reaction method. Crystallite structure of the ceramics was studied using X-ray diffraction. The rhombohedral phase and tetragonal phase coexist in the BNBKT-xZr ceramics. The doping of Zr4+ into BNBKT lattice increases the percentage of the tetragonal phase. The size and shape of grains in the ceramics were affected by the doping of Zr4+ ions. For all the unpoled ceramics, two dielectric anomalies are observed in the dielectric constant-temperature curves. The maximum values of dielectric constant and corresponding temperatures change with the variation of Zr4+ amount. The doping of Zr4+ ions causes a decrease in the ferroelectric properties.
KeywordsLead-free ceramic Dielectric properties Ferroelectricity Microstructure
This work was supported by the National Natural Science Foundation of China (No. 51372147, 11004127), Shaanxi Province Science and Technology Foundation (No. 2012KJXX-30), Fundamental Research Funds for the Central Universities (No. GK201305006, GK201401003), Specialized Research Fund for the Doctoral Program of Higher Education (No. 20120202110004), Innovation Funds of Graduate Programs, Shaanxi Normal University (Grant no. 2013CXS009) and National University Student Innovation Program (No. 201310718033).
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