High Electromechanical Coupling Piezoelectrics - How High Energy Conversion Rate is Possible

1996 ◽  
Vol 459 ◽  
Author(s):  
Kenji Uchino
Keyword(s):  
Energy Conversion ◽  
Lead Zirconate Titanate ◽  
Conversion Rate ◽  
Electromechanical Coupling ◽  
Crystal Form ◽  
Lead Zirconate ◽  
High Energy ◽  
Coupling Factor ◽  
Lead Zinc ◽  
Titanate Ceramics

ABSTRACTA new category of piezoelectric ceramics with very high electromechanical coupling was discovered in a lead zinc niobate:lead titanate solid solution in a single crystal form. The maximum coupling factor k33 reaches 95%, which corresponds to the energy conversion rate twice as high as the conventional lead zirconate titanate ceramics. This paper reviews the previous studies on superior piezoelectricity in relaxor ferroelectric: lead titanate solid solutions and on the possible mechanisms of this high electromechanical coupling.

scholarly journals Energy conversion with Zr-rich lead zirconate/titanate ceramics

1997 ◽  
Vol 71 (13) ◽  
pp. 1786-1788 ◽  
Author(s):  
Ning Duan ◽  
Noé Cereceda ◽  
Beatriz Noheda ◽  
José Raúl Fernandez-del-Castillo ◽  
Julio A. Gonzalo
Keyword(s):  
Energy Conversion ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Zirconate Titanate ◽  
Titanate Ceramics

Polarization switching mechanisms and electromechanical properties of La-modified lead zirconate titanate ceramics

1995 ◽  
Vol 10 (4) ◽  
pp. 926-938 ◽  
Author(s):  
Jie-Fang Li ◽  
Xunhu Dai ◽  
Albert Chow ◽  
Dwight Viehland
Keyword(s):  
Domain Structure ◽  
Lead Zirconate Titanate ◽  
Electromechanical Coupling ◽  
Polarization Switching ◽  
Lead Zirconate ◽  
Coupling Mechanism ◽  
Electromechanical Properties ◽  
Transmission Electron ◽  
Domain State ◽  
Titanate Ceramics

The electromechanical properties of (Pb1−xLax)(ZryTi1−y)O3 [PLZT x/y/(1 - y)] have been investigated in the compositional range 0 < x < 0.10 for y = 0.65 (rhombohedral PLZT) and 0 < x < 0.18 for y = 0.40 (tetragonal PLZT). Both field-induced strains (∊-E) associated with polarization switching and piezoelectric responses (d33) were studied. Transmission electron microscopy (TEM) and dielectric investigations were also performed. Room temperature TEM investigations revealed common trends in the domain structure with increasing La content for both PLZT x/65/35 and x/40/60, including a micron-sized domain structure, a subdomain tweed-like structure, and a nanopolar domain state. Changes in the field-induced strains and piezoelectric properties were then related to these microstructural trends. The dominant electromechanical coupling mechanism in the micron-sized domain state was found to be piezoelectricity. However, an electrostrictive coupling became apparent with the appearance of the subdomain tweed-like structures, and became stronger in the nanopolar domain state. It is believed that polarization switching can-occur through 70°or 110°domains, the subdomain tweed-like structure, or nanopolar domains depending on La content.

Piezoelectric Thin Film Ultrasonic Micromotors

1991 ◽  
Vol 243 ◽  
Author(s):  
K. R. Udayakumar ◽  
J. Chen ◽  
K. G. Brooks ◽  
L. E. Cross ◽  
A. M. Flynn ◽  
...  
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Electromechanical Coupling ◽  
Breakdown Strength ◽  
Relative Dielectric Constant ◽  
Electromechanical Coupling Factor ◽  
Lead Zirconate ◽  
Coupling Factor ◽  
New Family ◽  
Piezoelectric Thin Film

AbstractThin films of lead zirconate titanate have been fabricated for application to a new family of flexure-wave piezoelectric micromotors that are characterized by low speed and high torque. The high relative dielectric constant and breakdown strength of the films lead to high stored energy densities. Evaluation of the film as a bimorph yielded a value of -88 pC/N for the transverse piezoelectric strain coefficient, d31; the relevant electromechanical coupling factor, k31, calculated thereupon was 0.22. The development of the piezoelectric ultrasonic micromotors from the PZT thin films, and the architecture of the stator structure are described. Nonoptimized prototype micromotors show rotational velocities of 100-300 rpm at drives of 3-5 V.

Piezoelectric Behavior Based on Mixing-Doped in Lead Zirconate Titanate Ceramics and Application

2011 ◽  
Vol 189-193 ◽  
pp. 4126-4129
Author(s):  
Bing Huei Chen ◽  
Long Wu
Keyword(s):  
Lead Zirconate Titanate ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Lead Zirconate ◽  
Coupling Factor ◽  
Mechanical Quality Factor ◽  
Ceramic Technology ◽  
Zirconate Titanate ◽  
Cation And Anion Vacancies

In this investigation, we extend our previous works to improve piezoelectric properties of Pb(Zr,Ti)O3 ceramics. Modified lead zirconate titanate (PZT) piezoceramics with a composition Zr/Ti=53/47 containing a trace of mixing dopants were prepared by conventional ceramic technology sintering powder compacts. Replacement of (Zr, Ti)+4 by Nb+5, Pb+2 by Sb+3 and Mn+4 in PZT perovskite type solid solutions was accomplished by the creation of cation and anion vacancies. Modified ceramics were explored as a function of firing temperature to acquire exceedingly good piezoelectric characterizations. From the analysis results, calcined at 850°C for 2 h, and then sintered at 1280°C for 2 h, PZT piezoceramic showed the larger dielectric constant er 2013, mechanical quality factor Qm 120 and maximum electromechanical coupling factor kp 0.67. Besides, the bulk ceramic grains distribution were found to be uniform. Furthermore, the sample was found to possess piezoelectric properties, the resonance frequency being about 200 KHz suitable for acoustic sensor.

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