Relaxor based ferroelectric single crystals for electromechanical actuators

被引：14

作者：

Park, SE ^{[1
]}

Vedula, V ^{[1
]}

Pan, MJ ^{[1
]}

Hackenberger, WS ^{[1
]}

Pertsch, P ^{[1
]}

Shrout, TR ^{[1
]}

机构：

[1] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA

来源：

SMART STRUCTURES AND MATERIALS 1998: SMART MATERIALS TECHNOLOGIES | 1998年 / 3324卷

关键词：

relaxor ferroelectrics; single crystal; actuator; piezoelectrics; hysteresis; prestress;

D O I：

10.1117/12.316856

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

The piezoelectric properties of relaxer based ferroelectric single crystals, such as Pb(Zn1/3Nb2/3)O-3 - PbTiO3 (PZN-PT) and Pb(Mg1/3Nb2/3)O-3 - PbTiO3 (PMN-PT) were investigated for electromechanical actuators. In contrast to polycrystalline materials such as Pb(Zr,Ti)O-3 (PZT's), morphotropic phase boundary (MPB) compositions were not essential for high piezoelectric strain. Piezoelectric coefficients (d(33)'s) > 2500 pC/N and subsequent strain levels up to >0.6% with minimal hysteresis were observed. Crystallographically, high strains are achieved for < 001 > oriented rhombohedral crystals, though < 111 > is the polar direction Ultrahigh strain levels up to 1.7%, an order of magnitude larger than those available from conventional piezoelectric and electrostrictive ceramics could be achieved, being related to an E-field induced phase transformation. Strain vs. E-field behavior under external stress was also much superior to that of conventional piezoelectric ceramics. High electromechanical coupling (k(33)) > 90% and low dielectric loss <1%, along with large strain make these crystals promising candidates for high performance solid state actuators.

引用

页码：136 / 144

页数：9