Abstract
Plate resonators (dimensions: 13L×4.0W×0.36T mm3) composed of relaxor single-crystal plates with a giant k31 (>80%) in Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 (PZNT91/09) with the (100) plane and Pb[(Mg1/3Nb2/3)0.74T0.26]O3 (PMNT74/26) with the (110) plane were investigated regarding their vibration modes in the directions of length (k31 mode) and width (k32 mode). Frequency response analysis of impedance on the giant k31 mode was evaluated by a finite element method (FEM) and the simulated data by FEM were compared with the measured results. A large anisotropy of the Poisson ratio of the length direction (σLE) and the width direction (σWE) was observed and the ratios of σWE/σLE reached 3.2–3.4 in the PZNT91/09 single-crystal plates and 4.5–4.9 in the PMNT74/26 single-crystal plates. Although σWE/σLE was fixed at 3.2 (PZNT91/09) and 4.9 (PMNT74/26), σLE and σWE were further changed; the simulated data were well fitted to the measured data in the cases of the PZNT91/09 and PMNT74/26 single-crystal plates. In the PZNT91/09 single-crystal plates, the Poisson ratio on the k31 and k32 modes affected the frequency response of impedance in the kt mode, which corresponds to thickness vibration of the plate. However, the Poisson ratio in the PMNT74/26 single-crystal plates was independent of the frequency response of impedance in the kt mode. Moreover, the domain behavior of the PZNT91/09 single-crystal plates could be explained by the simulated impedance responses on the third overtone of the k31 fundamental vibration.
Published Version
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