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Reasearch and Development on Ferroelectric Domain Controlled Ceramics

铁电畴控陶瓷的研究与开发

基本信息

批准号：
12650327
负责人：
OGAWA Toshio
金额：
$ 2.05万
依托单位：
Shizuoka Institute of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650327/
关键词：
ferroelectric Domain Poling Field Dependence Domain Switching Domain Rotation head Free Piezoelectric Ceramics Domain Control Pb[(Zn<1 3>Nb_<2 3>)_<0.91>Ti_<0.09>O_3 Single Crystal Giant Electromechanical Coupling Factor of K_<31> Mode /

项目摘要

(1)Domain behavior of ferroelectric materials was investigated by a poling field (E). Ferroelectric materials evaluated consist of lead zirconate titanate (PZT), lead titanate (PT), barium titanate (BT), Bi-layer structured SrBi_4Ti_4O_<15> (SBT) ceramics and Pb(Zn<1/3>Nb_<2/3>)_<0.91>Ti_<0.09>O_3 (PZNT91/09) single crystal. Changing the poling field (E) from 0→+E→0→E→0 to +E, the electromechanical coupling factor (k), dielectric constant (εr) and frequency constant (fc) were measured. The minimum k and εr were obtained at the same E because of the 180゜ domain clamping. The E due to the domain clamping corresponded to the coercive field (Ec) determined by the poling field dependences. At the Ec, maximum fc was confirmed in the cases of soft PZT (tetragonal and rhombohedral), hard PZT (tetragonal), BT ceramics and PZNT91/09 single crystal. It was thought that the materials became mechanically hard by the electrical attracting through the domain clamping. In hard PZT (rhombohedral), PT, BT and SBT ceramics, the peak of εr and minimum fc were observed at an E, which corresponds to the threshold of domain rotations. At the E, the ceramics become mechanically soft because of the domain rotations.(2)The giant electromechanical coupling factor of k_<31> mode over 80% had been found by realizing the mono-domain in the case of PZNT91/09 single crystal plates. From the investigation of the fc which corresponds to a half of the bulk wave velocity, the giant k_<31> appeared in the case of the phase with low crystal symmetry in comparison with tetragonal phase.(3)Piezoelectric bimorphs were prepared to utilize the giant k_<31>. The PZNT91/09 single crystal bimorph showed the superior piezoelectric properties such as three orders of magnitude larger than the PZT ceramic bimorph regarding the impedance ratio on the resonant and the anti-resonant frequencies.

(1)利用极化场(E)研究了铁电材料的畴行为。评价的铁电材料包括钛酸锆铅（PZT）、钛酸铅（PT）、钛酸钡（BT）、双层结构SrBi_4Ti_4O_<15> (SBT)陶瓷和Pb(Zn<1/3>Nb_<2/3>)_<0.91>Ti_<0.09>O_3 （PZNT91/09）单晶。将极化场(E)由0→+E→0→E→0变为+E，测量了电耦合系数(k)、介电常数（εr）和频率常数（fc）。由于180域箝位，在相同的E处获得最小k和εr。畴夹紧引起的E对应于由极化场依赖性决定的矫顽力场（Ec）。在Ec下，软质PZT（四边形和菱形）、硬质PZT（四边形）、BT陶瓷和PZNT91/09单晶的fc值最大。人们认为，通过畴夹紧产生的电吸引使材料变得机械坚硬。在硬PZT（菱形）、PT、BT和SBT陶瓷中，εr的峰值和fc的最小值出现在E点，对应于畴旋转的阈值。在E点，陶瓷由于畴旋转而变得机械柔软。(2)在PZNT91/09单晶片的情况下，通过实现单畴，发现k_<31>模式的巨大机电耦合系数大于80%。从体波速度的一半对应的fc的研究来看，与四方相相比，在晶体对称性较低的相中出现了巨大的k_<31>。(3)利用巨大的k_<31>制备了压电双晶片。PZNT91/09单晶双晶片在谐振频率和反谐振频率上的阻抗比均比PZT陶瓷双晶片大3个数量级，表现出优异的压电性能。