利用固相反应法制备了(Na 0.52 K 0.48-x Li x)(Nb 0.86 Ta 0.10 Sb 0.04)O 3系无铅压电陶瓷, 研究了不同Li含量(x分别为0、0.02、0.04、0.06、0.08)样品的显微结构、物相组成及电性能. 结果表明, Li含量的改变对其物相组成、压电性能、铁电性能、介电性能都有显著影响. 当Li含量x从0增大到0.04时, 其压电性能相应提高, 当Li含量x超过0.04时, 压电性能明显下降; 在x=0.04时综合性能最好, 其压电常数d33高达260pC/N, 介电损耗tanδ为0.027, 平面机电耦合系数kp值达到50%, 剩余极化强度Pr为22μC·cm-2, 矫顽电场Ec为0.95kV·mm-1, 居里温度为316℃. 另外, 随着Li含量增加, 该系统的矫顽电场明显增强, 居里温度有所提高.
Lead-free piezoelectric(Na 0.52 K 0.48-x Li x)(Nb 0.86 Ta 0.10 Sb 0.04)O3 ceramics were prepared by solid state reaction. The microstructure, phase and electric properties were studied for (Na 0.52 K 0.48-x Li x )(Nb 0.86 Ta 0.10 Sb 0.04 )O3 samples with different Li content (x being 0, 0.02, 0.04, 0.06, 0.08). Results show that their phases, piezoelectric, dielectric and ferroelectric properties of (Na 0.52 K 0.48-x Li x)(Nb 0.86 Ta 0.10 -Sb 0.04) O3 lead-free ceramics are μch influenced by the content of Li ions. The piezoelectric properties are enhanced when Li content increases from 0 to 0.04, and decreased when Li content (x) is more than 0.04. Best electric properties are obtained for the sample when x equals 0.04,with its piezoelectric constant d33 being 260pC/N, dielectric loss tanδ being 0.027, planar coupling factor k p being 50%, remanent polarization P r being 22μC·cm-2, coercive electric field E c being 0.95kV·mm-1, Curie temperature being 316℃. With the increase of Li content, the coercive electric field E c increases obviously, and the Curie temperature is also enhanced.
参考文献
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