摘要
研究了(1-x)(0.96Bi0.5Na0.5TiO3-0.04BaTiO3)-x(0.98K0.5Na0.5NbO3-0.02LiTaO3)(BNTBT-KNNLT)体系在0≤x≤0.07这一组分区域的结构和性能。X射线衍射谱发现,这一系列组分在室温下形成纯钙钛矿型固溶体,没有其他杂相产生。(111)峰的峰位和峰形随组分的变化有规律的变化。随着KNNLT组分的加入,压电及介电等性能有比较明显的改变。压电性能随KNNLT的加入出现最大值。当x=0.02时,压电常数d33=125pC/N。介电常数在室温下随组分的增加而增加。电滞回线的结果显示,尽管在BNTBT中掺杂了KNNLT,这一系列的压电陶瓷仍然具有较大的矫顽场。当x=0.02时,室温下介电常数和剩余极化强度分别为:εr=1455,Pr=32.3μC/cm2。实验结果表明适量的KNNLT掺杂进BNTBT中可以改善BNTBT的压电和介电性能。
Lead-free piezoelectric ceramics (1-x)(0.96Bi0.5Na0.5TiO3-0.04BaTiO3)-x(0.98K0.5Na0.5NbO3-0.02LiTaO3)(BNTBT-KNNLT) with xffi0-0.07 were synthesized by a conventional sintering technique. All samples present pure perovskite structure, showing room temperature symmetries of rhombohedral at x≤0.03, and of pseudocubic at x≥0.05. The composition 0.98 (0.96Bi0.5Na0.5TiO3-0.04BaTiO3)-(0.98K0.5Na0.5NbO3-0.02LiTaO3) exhibits the improved properties, which are as follows: piezoelectric constant d33=125 pC/N, dielectric constant εr=1455, remanent polarization Pr=32.3 μC/cm^2, and coercive electric field Ec=3.1 kV/mm. The results indicate that the added KNNLT into BNTBT helps to improve the electrical properties of BNT-based ceramics.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第A02期282-285,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50802029)
清华大学新型陶瓷与精细工艺国家重点实验室课题基金资助
关键词
无铅压电陶瓷
压电性能
介电性能
铁电性能
lead-free ceramics
piezoelectric properties
dielectric properties
ferroelectric properties