Study of dielectric and electromagnetic shielding behaviour of BaTiO 3 ‐CoFe 2 O 4 filled LDPE composite

This paper reports the formation of BaTiO 3 /CoFe 2 O 4 (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 CoFe 2 O 4 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°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.