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Vol. 109, Issue 10, October 2009, pp. 108-116

 

Bullet

 

Remarkable Electromechanical Coupling in the 2–2 Composite Based on Single-domain PMN–0.33PT Crystal

 

1Vitaly Yu. TOPOLOV, 2Sergei V. GLUSHANIN, 3Christopher R. BOWEN and 4Anatoly E. PANICH

1Department of Physics, Southern Federal University, 5 Zorge street, 344090 Rostov-on-Don, Russia

Tel.: +007-(863)-2975127, fax +007-(863)-2975120

2Laboratory of the Centre of Studies on Security Problems,
Russian Academy of Sciences & South-Russian State University of Economy and Service,
147 Shevchenko Street, 346500 Shakhty, Rostov Region, Russia

Tel.: +007-(8636)-237222, fax +007-(8636)-225491

3Materials Research Centre, Department of Mechanical Engineering, University of Bath,
BA2 7AY Bath, United Kingdom

Tel.: +44-(1225)-383660, fax +44-(1225)-386098

4Department of High Technologies and Innovations, Southern Federal University,
10 Milchakov street, 344090 Rostov-on-Don, Russia

Tel.: +007-(863)-2223401, fax +007-(863)-2434844

E-mail: vutoplov@sfedu.ru, glushanin@inbox.ru, c.r.bowen@bath.ac.uk, piezo@sfedu.ru

 

 

Received: 9 July 2009   /Accepted: 23 October 2009   /Published: 30 October 2009

 

Abstract: A novel parallel-connected 2–2 single-domain 0.67Pb(Mg1/3Nb2/3)O3 – 0.33PbTiO3 crystal / polymer composite with various orientations of polarization vectors of the components is proposed to analyze behavior of electromechanical coupling factors k*3j and k*k where j = 1, 2 and 3. It is shown that the combination of the highly piezo-active relaxor-ferroelectric single-domain component and the piezoelectric polymer provides considerable values of k*k  (min k*k » –0.8 and max k*k»  0.7) and |k*33| (about 0.9). The active role of the polarization orientation effect and the composite structure in attaining the high performance is emphasized in this work. A strong correlation between k*k and the hydrostatic piezoelectric coefficient is first revealed near min k*k and max k*k of the 2–2 composite. Some advantages concerned with the presence of the single-domain component in the 2–2 composite are discussed in connection with the large values of k*3j and k*k as well as with the considerable anisotropy of k*3j.

 

Keywords: 2–2 composite, Electromechanical coupling factor, Piezoelectric coefficients, Polarization orientation effect

 

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