Study of dielectric and electromagnetic shielding behaviour of BaTiO3-CoFe2O4 filled LDPE composite

This paper reports the formation of BaTiO3/CoFe2O4 (BT-CFO) filled low-density-polyethylene (LDPE) composite via the process of melt mixing and characterization for their dielectric and electromagnetic shielding behaviors. The X-Ray diffraction (XRD) result of synthesized CoFe2O4 shows the cubic phase structure formation with a crystallite size of 28.6 nm. The BT nanopowder and synthesized nanopowder of Cobalt ferrite (CFO) were mixed together in an equal amount (50:50), and sintered at 800 degrees C for 1 hour. A series of samples of BT-CFO was prepared by taking a different amount of BT-CFO (ie, 4, 8, 12, 16, and 20 wt%) with LDPE. The dielectric measurements of BT-CFO/LDPE composites were carried out at different temperatures using LCR meter at a frequency range from 40 Hz to 5 MHz. The dielectric behaviour of samples exhibited a change in dielectric constant with an increase in temperature and frequency. The electromagnetic shielding measurements were examined over X-band with a frequency range from 8.2GHz to 12.4GHz of the prepared BT-CFO/LDPE composites. The EMI shielding effectiveness of prepared BT-CFO/LDPE composites exhibited a maximum value of 17.9 dB.