PZT/ZnOアクチュエーターにおける還元性ガスペの機械的応答

概要

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Electrostrictive behavior responding to reducing gas (CO, H_2) atmospheres was investigated on a piezoelectric actuator consisting of a dense PZT plate (Pb_<0.995> Nb_<0.01> (Zr_<0.53>Ti_<0.47>)_<0.99>0_3) and a porous ZnO plate (Zn0+0.2 mol% Li_20+10 mol% NiO) . The dense PZT and press formed ZnO disks were bonded by hot pressing using glassfrits. The PZT side of the actuator showed a shrinkage by a d.c. bias at 250℃, and its value was larger in reducing gas atmosphere than in air. When measured on the separated plates, the PZT and ZnO plates had high resistivities in the same level in air but only the ZnO showed a decrease in resistivity by introduction of reducing gas. It is assumed that the applied voltage is distributed to both plates in air, but concentrated to the PZT part in reducing gas at mospheres due to a decrease in resistance of the ZnO part. The bending displacement of the actuator was also observed in reducing gas atmosphere, although the precise value was not obtained due to the high tem perature in measurements.
社団法人日本セラミックス協会の論文
1995-01-01