Dielectric performance of composites of <scp> BaTiO ₃ </scp> and polymers for capacitor applications under microwave frequency

Abstract Composites of nano‐sized barium titanate (BaTiO 3 ) with volume fractions up to 0.5 and poly(butylene terephthalate) (PBT) or linear low‐density polyethylene (LLDPE) were made via extrusion. Scanning electron microscopy demonstrated that BaTiO is well dispersed in the polymer matrices. The crystalline content (DSC) thermal stability (TGA) both polymers decreased increasing loading. Dielectric properties composites measured using a vector network analyzer. Both dielectric permittivity tangent loss increased content. At 2.45 GHz, for 48 vol% ‐filled LLDPE 43 PBT was 25 21.2, respectively. There good fit between Lichtenecker model experimental data obtained certain value, variations being dependent on fraction. improved performance achieved inclusion confirms composite systems as potential candidates microwave frequency capacitor applications.