Dielectric and piezoelectric properties of lead-free (Na0.5K0.5)NbO3-SrTiO3 ceramics
Dielectric and piezoelectric properties of lead-free (Na0.5K0.5)NbO3-SrTiO3 ceramics
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DOI：
10.1016/j.ssc.2003.10.026
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发表时间：
2004-02-01
影响因子：
2.1
通讯作者：
Ohsato, H
中科院分区：
文献类型：
--
作者：
Guo, YP;Kakimoto, K;Ohsato, H
本文报道了在空气中用普通烧结法成功地制备了致密的[（Na_（0.5）K_（0.5））（1-x）Sr_x]（Nb_（1-x）Ti_x）O_3（x = 0.005-0.100）陶瓷。用X射线衍射技术测定了相结构与SrO和TiO_2掺杂量的关系。发现在x = 0.040附近，晶体结构由正交晶系转变为四方晶系。介电研究表明，介电弛豫行为诱导的SrO和TiO 2掺杂到（Na 0. 5 K 0. 5）NbO 3。在x = 0.005 ~ 0.020范围内，样品具有优良的电学性能，压电常数d（33）= 90-96 pC/N，机电平面耦合系数k（p）= 26.6-32.5%，机电厚度耦合系数k（l）= 39.8- 43.8%。结果表明，[（Na_（0.5）K_（0.5））（1-x）Sr-x]（Nb_（1-x）Tix）O_（3-）陶瓷是一种很有前途的无铅机电换能器材料。(C)2003爱思唯尔有限公司。保留所有权利。
In this article, we report successful preparation of dense [(Na0.5K0.5)(1-x)Sr-x](Nb1-xTix)O-3 (x = 0.005-0.100) ceramics by ordinary sintering in air. The dependence of phase structure on doping content of SrO and TiO2 has been determined by the X-ray diffraction technique. It was found that the crystal structure changed from orthorhombic to tetragonal at x approximate to 0.040. Dielectric study revealed that the dielectric relaxor behavior was induced by doping of SrO and TiO2 into (Na0.5K0.5)NbO3. The samples in the composition range from x = 0.005 to 0.020 exhibited excellent electrical properties, piezoelectric constant of d(33) = 90-96 pC/N, electromechanical planar and thickness coupling coefficients of k(p) = 26.6-32.5% and k(l) = 39.8-43.8%. The results show that the [(Na0.5K0.5)(1-x)Sr-x](Nb1-xTix)O-3 ceramics are one of the promising lead-free materials for electromechanical transducer applications. (C) 2003 Elsevier Ltd. All rights reserved.