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Linked orientation effects and a large anisotropy of effective parameters of novel 2-1-2 composites based on ferroelectrics

Russian version

Topolov V. Yu.

¹Southern Federal University, Rostov-on-Don, Russia

Email: vutopolov@sfedu.ru

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Abstract
References
Статистика просмотров

Orientation dependences of electromechanical coupling factors k_3j^*, squared figures of merit (Q_3j^*)² and their anisotropy factors are studied in the 2-1-2 composites at rotations of the main crystallographic axes of [011]-poled ferroelectric single crystal and bases of ferroelectric ceramic rods. Validity of the large-anisotropy conditions |k₃₃^*/k_3f^*|≥ 5 and (Q₃₃^*/Q_3f^*)²≥ 10 is analyzed by considering two rotation modes in the composites based on one of single crystals, 0.935Pb(Zn_1/3Nb_2/3)O₃-0.065PbTiO₃ or 0.72Pb(Mg_1/3Nb_2/3)O₃-0.28PbTiO₃. Results are to be taken into account when creating high-effective piezo-active composites for transducers, sensors, acoustic and energy-harvesting devices. Keywords: piezo-active composite, orientation dependences, anisotropy, electromechanical coupling factor, figure of merit.

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