These components provide very high electromechanical coupling coefficient
, resulting in broader bandwidth and higher sensitivity than traditional piezoelectric bulk components.
The property of importance is the electromechanical coupling coefficient
of the films, which is a function of the processing temperature.
The electromechanical coupling coefficient, kt, in the thickness direction, along with other characteristics, such as the mechanical quality factor, [Q.
This discrepancy seen from the measurements of the electromechanical coupling coefficient may be because the composites consist of an electromechanical ceramic embedded into a polymer matrix.
Composites of 1-3 connectivity tend to have high piezoelectricity and electromechanical coupling coefficients but are difficult and expensive to fabricate.
The Table shows the composites exhibit lower values for their respective electromechanical coupling coefficients than the copolymer and ceramic.
For applications requiring miniaturization, Morgan Technical Ceramics' PMN-PT28 single crystal piezoelectric material is manufactured in a high temperature crystal grown process, which exhibits very large electromechanical coupling coefficients
as well as high dielectric constants and low dielectric losses, resulting in more sensitive sensors and more efficient transducers and actuators.