Pyroelectric infrared radiation detectors are one of kind thermal sensors, operating at ambient temperature,
unlike semiconductor detectors, which require cooling. They also have a uniform spectral response in a
wide range of wavelengths, including the main band of infrared transmission of the earth's atmosphere.
Recently, 0-3 composites consisting of ferroelectric ceramic particles dispersed in a ferroelectric polymer
have stimulated interest due to their good mechanical flexibility and strength, and excellent piezoelectric
and pyroelectric properties. Lithium tantalite [(LiTaO3), LT] ceramic particles have been incorporated into
a polyvinylidene fluoride-trifluoroethylene [P(VDF-TrFE) 70/30 mol%] copolymer matrix to form
composite films. The films were prepared using solvent casting method with the LT powder
homogeneously dispersed in the P(VDF-TrFE) copolymer matrix with various volume fractions. Electrical
properties such as the dielectric constant, dielectric loss, and pyroelectric coefficient have been measured as
a function of temperature as well as frequency. In addition, materials' figures-of-merit have also been
calculated to assess their use in infrared detectors. The results show that the fabricated lithium tantalite:
polyvinylidene fluoride-trifluoroethylene composite films have a good potential for uncooled infrared
sensor applications operating at moderate temperatures.