Abstract
Piezoceramic powder of Pb0.93La0.07(Zr0.52Ti0.48)O3 and a solution of polyvinylidene fluoride (PVDF)/dimethylformamide (DMF) were used to synthesize a composite system of PVDF/PLZT. The hot-press technique was employed to make the series of the composite (100 − x) PVDF/x PLZT; where x = 0, 5, 10, 15 and 20 wt%. X-Rays Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) techniques were utilized to study the structural evolution of PVDF polymorphs; α, β and γ phases with increasing content of PLZT wt.%. It was noticed that the content of the polar β-PVDF phase gradually increases from 26.1 % to 44.9 % with increasing PLZT content from 0 to 20 wt%, respectively. The incorporation of inherently piezoelectric PLZT into PVDF motivated effectively transforming the non-polar α- PVDF phase into the polar β-PVDF phase. The inherent piezoelectricity and formed intra-molecular [OH] in PLZT lattice were suggested for a self-poling process of β-PVDF phase conformation. PVDF/PLZT mechanical behavior was tested by nanoindentation technique. Mechanical properties such as Young’s modulus (Y) and Hardness (H) showed an inconsistent behavior with PLZT content. Such a behavior was referred to a synergistic effect of increasing void-content with the growing stiffer β-PVDF phase.
Published Version
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