Microstructure, dielectric and piezoelectric properties of La-modified Bi0.5(Na0.84K0.16)0.5TiO3 le

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• 作者：Qiaoji Zheng ; Jian Ma ; Dunmin Lin
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：24
• 期：10
• 页码：3836-3843
• 全文大小：1508KB
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• 作者单位：Qiaoji Zheng (1) (2)
  Jian Ma (2)
  Dunmin Lin (1)
  
  1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
  2. College of Electrical and Information Engineering, Southwest University for Nationalities, Chengdu, 610041, China
  
• ISSN：1573-482X

文摘

Lead-free ceramics (Bi1?xLax)0.5(Na0.84K0.16)0.5TiO3 were prepared by a conventional ceramic technique and the effects of La doping and sintering temperature on the microstructure, ferroelectric and piezoelectric properties of the ceramics were studied. All the ceramics possess a pure perovskite structure and La3+ diffuses into the Bi0.5(Na0.84K0.16)0.5TiO3 lattices to form a solid solution with a rhombohedral symmetry. The addition of La leads to the significant change in the grain morphology and size for the (Bi1?xLax)0.5(Na0.84K0.16)0.5TiO3 and a number of rod grains with the length of 10-0?μm and the diameter of 1-?μm are observed in the ceramic with x?=?0.04 sintered at 1,140?°C for 2?h. However, as sintering temperature increases to 1,160?°C, the rod grains disappears and the uniform and rectangular grains are observed in the ceramics with x?=?0.04. As x increases from 0 to 0.06, the coercive field E c of the ceramics decreases from 4.33 to 2.81?kV/mm and the remanent polarization P r of the ceramics retains the high values of 25.9-7.7?μm/cm2. The depolarization temperature T d decreases from 154 to 50?°C with x increasing from 0 to 0.10. All the ceramics exhibit the diffusive phase transition at high temperature (280-20?°C). The ceramic with x?=?0.04 sintered at 1,150?°C for 2?h exhibit the optimum piezoelectric properties, giving d 33?=?165?pC/N and k p?=?32.9?%. The optimum sintering temperature is 1,150?°C at which the improved piezoelectric properties (d 33?=?165?pC/N and k p?=?32.9?%) are obtained. At the high La3+ level (x?=?0.10 and 0.12), the ceramics exhibit weak ferroelectricity (P r?=?13.0-1.2?μm/cm2) and thus possess poor piezoelectricity (d 33?=?17-7?pC/N).