1213 PZT圧電セラミクスのフレクソエレクトリック係数の測定(触覚センサ・触覚ディスプレイ,一般講演)

概要

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Flexoelectric effect is a phenomenon of electric polarization for strain gradient in material. It is usually discussed for material or matter such as liquid crystal which can have large strain gradient under large shape deformation. PZT ceramic is a well-known piezoelectric material but also shows flexoelectricity when it deforms with strain gradient. In this report, flexoelectric coefficient of poled soft material of PZT piezoelectric ceramic is experimentally measured. In order to obtain strain gradient, bending of PZT plate is adopted. Four-point bending provides constant strain gradient value in the thickness direction over the electrodes on the plate. Four PZT ceramic plates of the same composition are investigated but they show large individual difference of flexoelectricity. The mean value of the flexoelectric coefficient is 106.5 μC/m.
2010-04-18