INFLUENCE OF METHODS PREPARATION OF PARTICLES FERROELECTRICS ON ELECTROPHYSICAL PROPERTIES OF PIEZOELECTRIC COMPOSITES TYPES OF 0-3 AND 0-0-3
Laboratory technology was developed to fabricate flexible piezocomposites type of ferroelectric phase – polymers which had dv∙gv (factor of reception) above 5000∙10–15 m2/N. The value of this coefficient was achieved by changing the type of percolation in the manufacture of material. This allowed the manufacture of a new typepiezocomposites, with connectivity 0–1–3. The first part particles of the active phase in these materials have the connectivity of 0, and the other part of them-1 connectivity. To improve the efficiency of the process of polarization of composites, particles of the active phase (ferroelectric) processed bi-functional substance (appret) in the first stage of the technological process. This method allows you to remove from the surface of the particles of the solid phase(ferroelectric) layer sorption which made up of water molecules and gases. The latter effect reduced the value of interfacial conductivity, i.e. prevented the voltage drop of the polarizing field. Matching of polymer conductivity and ferroelectrics particles by determining the optimal polarization temperature was carried out as well. Discussed the reasons for changing the electro-physical parameters of composites due to percolation type changes in the system.