Abstract The lead-free piezoelectric ceramics (Na .47 Bi .47 Ba .06 ) 1-x Ca x TiO 3 (x = 0, 0.01, 0.02, 0.03, 0.05, and 0.08, abbreviated as BNBTC/0, BNBTC/1, BNBTC/2, BNBTC/3, BNBTC/5, and BNBTC/8, respectively) were obtained using the solid-state reaction method. The structure, electric conductivity, and dielectric, ferroelectric, and piezoelectric properties of the Ca 2+ -doped (Na .47 Bi .47 Ba .06 )TiO 3 ceramics were thoroughly investigated. The ceramics sintered at 1200 °C exhibit dense microstructures, having relative densities higher than 96%. The X-ray diffraction results demonstrate that all ceramics have a pure perovskite structure. The mean grain sizes of the ceramics are related to the Ca 2+ quantity. A small quantity of Ca 2+ ions (x ≤ 0.03) improves the piezoelectric and ferroelectric properties of the samples. The dielectric behavior of the samples is sensitive to the Ca 2+ content and electric poling. The results demonstrate that the electrical properties of the (Na .47 Bi .47 Ba .06 )TiO 3 lead-free ceramics can be well tuned by varying the Ca 2+ quantity.

中文翻译：

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Ca 2+ 掺杂(Na 0.47 Bi 0.47 Ba 0.06 )TiO 3 无铅压电陶瓷的结构和电学性能

摘要 无铅压电陶瓷 (Na .47 Bi .47 Ba .06 ) 1-x Ca x TiO 3 (x = 0, 0.01, 0.02, 0.03, 0.05, and 0.08, 缩写为BNBTC/0, BNBTC/1 , BNBTC/2, BNBTC/3, BNBTC/5, 和 BNBTC/8) 分别使用固态反应方法获得。对掺杂Ca 2+ 的(Na .47 Bi .47 Ba .06 )TiO 3 陶瓷的结构、电导率、介电、铁电和压电性能进行了深入研究。在 1200 °C 下烧结的陶瓷显示出致密的微观结构，相对密度高于 96%。X 射线衍射结果表明所有陶瓷都具有纯钙钛矿结构。陶瓷的平均晶粒尺寸与Ca 2+ 量有关。少量 Ca 2+ 离子 (x ≤ 0.03) 可改善样品的压电和铁电性能。样品的介电行为对 Ca 2+ 含量和电极化敏感。结果表明，(Na .47 Bi .47 Ba .06 )TiO 3 无铅陶瓷的电性能可以通过改变Ca 2+ 的量来很好地调节。