ISSN:
1433-075X
Keywords:
Key words Relaxor ferroelectrics
;
Single crystal
;
Actuator
;
Piezoelectrics
;
Hysteresis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The piezoelectric properties of relaxor based ferroelectric single crystals, such as Pb(Zn1/3Nb2/3)O3−PbTiO3 (PZN-PT) and Pb(Mg1/3Nb2/3)O3−PbTiO3 (PMN-PT) were investigated for electromechanical actuators. In contrast to polycrystalline materials such as Pb(Zr,Ti)O3 (PZTs), morphotropic phase boundary (MPB) compositions were not essential for high piezoelectric strain. Piezoelectric coefficients (d33’s ) 〉2200 pC/N and subsequent strain levels up to 〉0.5% 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, possibly being related to an E-field induced phase transformation. High electromechanical coupling (k33) 〉90% and low dielectric loss 〈1%, along with large strain make these crystals promising candidates for high performance solid state actuators.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100190050014
Permalink