Pyroelectric properties of the PTCa/PEKK composite transducers

Ferroelectric thin films of ceramic/polymer composite sensors with mixed connectivities possess high values of piezo- and pyroelectric coefficients and the formability and flexibility which are not attainable in a single-phase ferroelectric material, an electroceramic or a polymer. The present paper reports a study of the pyro-, piezoelectric and dielectric properties of the ceramic/polymer composite films composed of the calcium modified lead titanate (PTCa) ceramic and the non-polar thermoplastic polymer, polyetherketoneketone (PEKK). The pyroelectric coefficient has been measured both by a direct method and the thermal step technique. Dielectric spectroscopy measurements were carried out in the frequency range of 10^-5 Hz to 10⁶ Hz at room temperature. Additionally, the magnitude of the piezoelectric coefficient d₃₃ and an estimation of the k_t coefficient are also reported. Furthermore, Scanning Electron Microscope (SEM) pictures are included in order to show the inner structure, mixed connectivity of the ceramic/polymer reported