The 0-3 connected ferroelectric composites made of PZT and PVDF have been examined for its different physical and dielectric properties. The standard methods presented in earlier literatures for the composite preparation have been compared to find an effective method. The distinction in the physical properties like density and porosity of the piezocomposite was studied and their SEM morphological facts are scrutinized. The dielectric constant of PZT-PVDF composite has been predicted by using standard models and the results are compared. Also the relaxation behavior of polymer at higher temperature has been justified.
PZT-PVDF composites were prepared using different particle size of PZT and a hot press apparatus has been used for making samples. The structural and compositional analysis of the composite sample was done by using Scanning Electron Microscope (SEM) and Energy Dispersive Analysis of X-rays (EDAX) respectively. The grain size of the ball milled PZT powder was analyzed using powder X-Ray Diffraction (XRD). The samples were poled at a fixed temperature for about an hour under different poling fields. The dielectric constant (ε r ) and the piezoelectric properties like piezoelectric strain coefficient (d 33 ) and voltage coefficient (g 33 ) of composite have been analyzed.
An attempt has been made to prepare PZT-polymer composite using Poly (methyl methacrylate) and a mixed polymer (Polyvinylidene fluoride and Polyvinyl chloride) as polymer phase. Based on the properties of polymer phases, two different preparation techniques have been used for the composite preparation and a hot press method has been adopted for the sample preparation. The inhomogeneity of ceramic phase over the polymer matrix has been revealed from the surface morphological studies. Dielectric constant and dielectric loss of the composite is found to be increased with the increase in temperature irrespective of poled and unpoled samples. Temperature dependence of AC conductivity increases with rise in temperature. The dielectric and pyroelectric performance of PZT-PMMA composite lags behind the PZT-PVDF/PVC composite.
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