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.

Automated summary

This paper investigates the formation of BaTiO3/CoFe2O4 filled low-density-polyethylene composite via melt mixing process and analyzes their dielectric and electromagnetic shielding behaviors. Different amounts of samples were prepared and the dielectric behavior of the composite material was found to change with increasing temperature and frequency, with an EMI shielding effectiveness of up to 17.9 dB.