Temperature dependence of material constants of PLZT ceramics

摘要

The piezoelectric resonance and the ferroelectric hysteresis loop were simultaneously measured in bulk 8/65/35 PLZT ceramics in the temperature range from 20 to 140 deg C. From the piezoelectric resonance data temperature dependences of several material constants in the vicinity of the transition from the relaxor to the induced ferroelectric state were extracted. It is shown, that the second order smeared continuous transition, through which the long-range ferroelectric state is established, reflects itself mostly in changes of the real part of the piezoelectric constant, the electromechanical coupling factor, and the electromechanical quality factor.