Dielectric and piezoelectric properties of (Bi0.5Na0.5)TiO3-(Bi0.5K0.5)TiO3 systems
Dielectric and piezoelectric properties of (Bi0.5Na0.5)TiO3-(Bi0.5K0.5)TiO3 systems
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DOI：
10.1143/jjap.38.5564
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发表时间：
1999-09-01
期刊：
影响因子：
--
通讯作者：
Otsuki, E
中科院分区：
文献类型：
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作者：
Sasaki, A;Chiba, T;Otsuki, E
在X = 0-1.0的成分范围内，研究了[Bi-0.5(Na1-x K-x)(0.5)]TiO3陶瓷的结构、介电和压电性能。样品采用常规烧结技术制备。X射线衍射结果表明，在X = 0.16 ~ 0.20范围内，（Bi0.5Na0.5）TiO3（菱形）与（Bi0.5K0.5）TiO3（四边形）之间存在向形态相界（MPB）。极化-电场磁滞回线表明，X = 0.20 （BNTK20）时的剩余极化大于X = 0.0 （BNT）时的剩余极化。机电耦合系数、介电常数、压电常数和弹性柔度在MPB区域X = 0.16 ~ 0.20处出现峰值。[Bi-0.5(Na1-xKx)(0.5)]TiO3的介电和压电性能在MPB区得到了增强，与Pb(Zr, Ti)O-3相似。
The structural, dielectric and piezoelectric properties of [Bi-0.5(Na1-x K-x)(0.5)]TiO3 ceramics were studied for the compositional range, X = 0-1.0. The samples were prepared by a conventional sintering technique. From X-ray diffraction results, it was found that the morphotropic phase boundary (MPB) between (Bi0.5Na0.5)TiO3 (rhombohedral) and (Bi0.5K0.5)TiO3 (tetragonal) exists in the range of X = 0.16-0.20. Polarization-Electric field hysteresis loops show that the remanent polarization at X = 0.20 (BNTK20) is larger than that at X = 0.0 (BNT). Peaks of electromechanical coupling factor, dielectric constant, piezoelectric constant and elastic compliance were obtained at X = 0.16-0.20 of the MPB region. Dielectric and piezoelectric properties are enhanced in the MPB region for [Bi-0.5(Na1-xKx)(0.5)]TiO3, similar to that observed for Pb(Zr, Ti)O-3.