Abstract
The paper proposes a new method for studying nonlinear processes in ferroelectric ceramics under external influences, based on the measurement and analysis of piezoelectric resonance spectra. The method provides high accuracy in determining complex elastic, dielectric and piezoelectric constants of piezoelectric materials, as well as their changes under external influences. To study nonlinear processes, we measured the dependences of complex electromechanical parameters of ferroelectrically «soft» piezoceramics based on PZT system on dc electric field. A physical interpretation of the results is proposed.
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