Giant Transverse-Mode Electromechanical Coupling Factor and Piezoelectric Strain in Relaxor Single-Crystal Plates Evaluated Using $P$–$E$ Hysteresis Loop

概要

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The relationships between the giant piezoelectricity of transverse-mode electromechanical coupling factor $k_{31}$ and longitudinal-mode electromechanical coupling factor $k_{33}$ were studied in the cases of Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 (PZNT91/09) with (100) plane and ($1 - x$)Pb(Mg1/3Nb2/3)O3–$x$PbTiO3 [PMNT($1 - x$)/$x$] ($x = 0.251--0.301$) with (110) plane. From the $P$–$E$ hysteresis loops and the electric field ($E$) vs strain measurement, a triple hysteresis loop was observed in PZNT91/09, and triple hysteresis and asymmetric hysteresis loops were obtained in $x = 0.273--0.293$ and $x = 0.251--0.262$ in PMNT($1 - x$)/$x$, while the giant $k_{31}$ was realized in the relaxor single crystals. Furthermore, the $E$ required to observe the triple and asymmetric loops corresponded to the $E$ of a break in the line for $E$ vs strain. It was considered that the $E$ was a coercive field to generate the DC-field-induced phase transition with giant $k_{31}$.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-09-25