Synthesis and properties of 0.7PVDF-0.3BTNN30/70 lead-free composites

Reference	Presenter	Authors (Institution)	Abstract
03-013	Jaciele Marcia Rosso	Rosso, J.M.(Universidade Estadual de Maringá); Burato, J.A.(Maringá State University); Volnistem, E.A.(Maringá State University); Bonadio, T.G.(Universidade Estadual do Centro-Oeste); Silva, D.M.(Maringá State University); Sanguino, G.(Maringá State University); Freitas, V.F.(Universidade Estadual do Centro-Oeste); Cótica, L.F.(Maringa State University); Santos, I.A.(Maringa State University);	Generally, a composite may be considered as a multiphased material that shows properties directly related to its constituent phases. However, the processing techniques and protocols can change some important physical properties, especially those intrinsic of an individual phase. Polymer-ceramic composites with ferroelectric properties combine the advantages of the ceramic phase with those of the polymer matrix, such as high piezoelectric and pyroelectric responses, stable mechanical properties, low mass density and high flexibility. In this investigation, polyvinylidene fluoride (PVDF, Alfa Aesar), and Ba0.3Na0.7Ti0.3Nb0.7O3 (BTNN30/70) ceramic powders, processed by high-energy ball milling, were used to synthesize 0.7PVDF-0.3BTNN30/70 polymer-ceramic composites. Microstructural, structural and dielectric properties of the processed samples were investigated by X-ray diffraction, scanning electron microscopy and impedance spectroscopy. Morphologically homogeneous samples were obtained and the dielectric measurements revealed dielectric constants well below those reported for the single-phased BTNN30/70 ceramics. Nonetheless, dielectric measurements reveal that our 0.7PVDF-0.3BTNN30/70 composite presented the highest dielectric constant (at room temperature and 1kHz) among the revised reports for polymer-ceramic composites with 30 % of the ceramic phase. These finds indicate the feasibility of the used synthesis protocol once the improvements of the dielectric response is a strong indication of the intimate interaction between the BTNN and PVDF phases in the 0.7PVDF-0.3BTNN30/70 composite.
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