半面電極試料を用いた PZT 圧電セラミックスの2次項非線形定数測定

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  • Measurement of the Nonlinear Coefficient of a Second-Higher Term in Lead Zirconate Titanate Piezoelectric Ceramics with Half-Surface Electrodes

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Second-harmonic voltage between a pair of electrodes, appearing due to nonlinearity, was theoretically calculated in piezoelectric rectangular vibrators with a pair of half electrodes which were driven by a sinusoidal constant current having the resonance frequency of length-extensional 1/2λ-mode vibration. The theoretical calculation was performed using the electrical equivalent circuit of a piezoelectric rectangular vibrator. A material constant as a nonlinear coefficient of second-higher term can be derived by using an equation, as that obtained in the present paper, showing the relationship between the magnitude of second harmonic voltage and the nonlinear coefficient of second-higher term.<br>

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