Origin of the Giant Piezoelectric Properties in the [001] Domain Engineered Relaxor Single Crystals

概要

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Relaxor single crystals PZN–9%PT have been cut and poled along [$\bar{1}01$] direction for which the spontaneous polarization $\mathbf{P}_{\text{s}}$ is approximately parallel to the poling field $\mathbf{E}_{\text{p}}$. The piezoelectric matrix of the monoclinic single-domain (1M state) has been determined, in the approximation of an orthorhombic symmetry. The shear mode (15) along [101], gives the highest electromechanical coupling factor $k_{15}$ (${>}80$%) and the largest piezoelectric coefficient $d_{15}$ (${\sim}3200$ pC/N). The properties of the disoriented 1M state have been calculated from a change of axes. The maximum of $d_{33}^{\theta\varphi}$ is obtained along a direction close to [001]. This is due to the very large value of $d_{15}$ compared to $d_{33}$ in the basic 1M state. On the other hand the transverse piezoelectric coefficient along [$uv0$] for the [001] disoriented $\mathbf{P}_{\text{s}}$ single domain presents a strong anisotropy. Finally, in the [001] domain engineered configuration, an important extrinsic contribution of the domain coexistence is evidenced by comparing calculated and measured coefficients.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-10-15