Dielectric properties of 0.25(BZT–BCT)–0.75[(1−x)PVDF–xCCTO] (x=0.02, 0.04, 0.06, 0.08 and 0.1) composites for embedded capacitor applications

Abstract

Abstract 0.25{0.5[Ba(Zr 0.2 Ti 0.8 )O 3 ]–0.5[(Ba 0.7 Ca 0.3 )TiO 3 ]/[BZT–BCT]}–0.75[(1 − x )(PVDF)– x CaCu 3 Ti 4 O 12 /(CCTO)] 0–3 composites (where x = 0.02, 0.04, 0.06, 0.08 and 0.1 volume fractions) were prepared by two step mixing and uniaxial hot-press method. The structural, micro structural and dielectric properties have been investigated and discussed in detail. There was an increase in relative permittivity ( e r ) of the composites with the increase in the volume fractions of the CCTO ceramics up to x = 0.08, and beyond it there was a decrease in e r . At room temperature (RT) and at 1 kHz frequency, [0.25(BZT–BCT)–0.69(PVDF)–0.06(CCTO)] composite showed a highest e r ∼ 90, making it suitable for embedded capacitor applications. Experimental data were fitted to several theoretical equations to find the equation useful for the prediction of the effective dielectric constant of the studied composites. The Lichtenecker equation, Yamada model and EMT models were found to be useful for the prediction of the effective dielectric constant of studied composites.