Pressure dependence of piezoelectric properties of a Pb(Mg1/3Nb2/3)O3–PbTiO3 binary system single crystal near a morphotropic phase boundary
Pressure dependence of piezoelectric properties of a Pb(Mg1/3Nb2/3)O3–PbTiO3 binary system single crystal near a morphotropic phase boundary
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DOI：
10.1088/0953-8984/18/32/014
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
N. Yasuda;T. Banno;K. Fujita;H. Ohwa;Mituyoshi Matushita;Y. Yamashita;M. Iwata;Y. Ishibashi
中科院分区：
文献类型：
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作者：
N. Yasuda;T. Banno;K. Fujita;H. Ohwa;Mituyoshi Matushita;Y. Yamashita;M. Iwata;Y. Ishibashi
研究了在25 °C、400 MPa压力下，沿沿着[001]方向极化的Pb[（Mg 1/3 Nb 2/3）0.68]Ti0.32O3二元系单晶的压电性能。对于横向机电特性，由于fr增大，fa几乎不变，k31模式的共振频率fr与反共振频率fa之差Δf、Δf/fr和机电耦合系数k31随静水压力（p）的变化都变小，k31在400 MPa时下降了16%。另一方面，对于纵向机电特性，Δf，Δf/由于fr和fa随p几乎恒定，fr和k33模式中的k33值随p几乎保持恒定。根据fr和fa的变化，弹性柔度s11 E和s33 E的值随p的变化很大。s11 E和s33 E在400 MPa下估计为分别为35.4和75.1 × 10−12 m2 N−1。一个机械品质因数Q几乎恒定的p在k33模式中，在K31模式中的Q与p在高达200 MPa的压力范围内的大幅度下降的对比观察。一个k33值几乎与p恒定被认为是，工程域概念的基础上，是由于稳定的域配置负责的纵向k33模式。此外，最近指出，菱面体[001]单晶在准同型相界组分附近的上级压电性能来自于其单畴性能的大剪切压电常数d15。从大剪切模式d15的贡献的观点来看，流体静压力不会影响压电特性，因为均匀的压力不会引入剪切应力。因此，对于k33模式测量的k33值在测量的压力范围内随着p保持几乎恒定。
The piezoelectric properties of a Pb[(Mg1/3Nb2/3)0.68]Ti0.32O3 binary system single crystal poled along the [001] direction in the rhombohedral phase were investigated under pressures up to 400 MPa at 25 °C. For the transverse electromechanical property, the difference Δf between the resonance fr and antiresonance frequencies fa, the Δf/fr and the electromechanical coupling coefficient k31 value in the k31 mode with hydrostatic pressure (p) became smaller because of the increase in fr and the almost constant fa with p. The k31 value decreased by 16% at 400 MPa. On the other hand, for the longitudinal electromechanical property, the Δf, the Δf/fr and the k33 value in the k33 mode with p remained almost constant because of the almost constant fr and fa with p. The changes in the values of the elastic compliances s11E and s33E with p were found to be large from the changes in fr and fa with p. s11E and s33E at 400 MPa were estimated to be 35.4 and 75.1 × 10−12 m2 N−1, respectively. A mechanical quality factor Q almost constant with p in the k33 mode in contrast to the large decrease in Q in the k31 mode with p in the pressure range up to 200 MPa was observed. A k33 value almost constant with p is considered, on the basis of the engineered domain concept, to be due to the stable domain configuration responsible for the longitudinal k33 mode. Furthermore, the superior piezoelectric properties of the rhombohedral [001] single crystal in the vicinity of the morphotropic phase boundary composition were recently pointed out to come from the large shear piezoelectric constant d15 of their single domain property. The hydrostatic pressure cannot influence the piezoelectric properties from the viewpoint of the contribution of the large shear mode d15, since the uniform pressure introduces no shearing stresses. Consequently, the k33 value measured for the k33 mode remained almost constant with p in the measured pressure range.