Studies on the High-Power Piezoelectric Property Measurement Methods and Decoupling the Power and Temperature Effects...

Area of Science:

• Materials Science
• Electrical Engineering
• Solid State Physics

Background:

• Small-signal characterization is insufficient for high-power piezoelectric applications.
• Existing high-power methods (constant voltage, constant current, transient) have limitations.
• PZT-5H piezoelectric ceramics are crucial for high-power transducers.

Purpose of the Study:

• To develop and validate a combined impedance method for high-power piezoelectric testing.
• To compare the combined impedance method with an improved transient method.
• To decouple the effects of power and self-heating temperature on piezoelectric properties.

Main Methods:

• Development of a combined impedance method integrating constant voltage and current techniques.
• Implementation of an improved transient method for high-power characterization.
• Testing of PZT-5H piezoelectric ceramics under varying high-power conditions.

Main Results:

• Increasing power led to rising electromechanical coupling (k31), piezoelectric constant (d31), and elastic compliance (s11E).
• Mechanical quality factor (Qm) initially decreased rapidly then stabilized.
• Combined impedance method caused significant self-heating; transient method maintained room temperature.

Conclusions:

• Self-heating significantly amplifies the power-induced changes in k31, d31, and s11E.
• Temperature effects on Qm were negligible.
• The developed methods enable accurate high-power piezoelectric performance assessment and understanding of coupled effects.