Dielectric properties of low-density polyethylene based nickel ferrite and copper ferrite

Abstract

Nickel and Copper ferrite of different compositions have been synthesized by wet co-precipitation technique. The synthesized samples were annealed at 800ºC for 4 hours and characterized by X-Ray Diffraction (XRD) analysis. The XRD pattern confirms the formation of a cubic structure with the crystalline size for nickel ferrite 23nm and copper ferrite 37nm. The composite has been synthesized with the various compositions (10wt% and 30wt%) of nickel ferrite and copper ferrite with pH values 6, 8 and 10 in LDPE. The Scanning Electron Microscopy (SEM) and Energy-dispersive X-ray spectrum (EDAX) confirms the homogeneous mixing of the composite material. The dielectric measurement has been carried out as a function of frequency at room temperature in the range of 1Hz-8MHz. The dielectric behaviour of Nickel ferrite and Copper ferrite based LDPE composite results decrease in dielectric constant and dielectric loss factor with the increase in frequency.

Electromagnetic interference of nickel ferrite and copper ferrite filled low-density polyethylene composite

“…The change in pH also reflects in particle size as shown in above Table 1 may also responsible in the change of SE. The dielectric properties of ferrite filled LDPE having different pH value and weight concentration reported earlier 14 also affects the shielding of electromagnetic waves. 19,20…”

“…The values of strongest peak, (hkl), calculated crystallite size and obtained crystalline phase of CuFe 2 O 4 and NiFe 2 O 4 for each pH value were tabulated in Table 1. 14–16 It was observed from Table 1 that as pH value increases from 6 to 10pH; the crystallite size also increases for both CuFe 2 O 4 and NiFe 2 O 4 .…”

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

“…The increase of dielectric constant at different temperature values is typical behaviour of the polymer. The sudden drop thereafter gradually increases with an increase in frequency and temperature till 5 MHz due to electrode polarization from space charge accumulation at the material interface and for LDPE the carrier was mostly a collection of electron and ions so the mobility of the charge carrier decreases 19–20 …”

“…The sudden drop thereafter gradually increases with an increase in frequency and temperature till 5 MHz due to electrode polarization from space charge accumulation at the material interface and for LDPE the carrier was mostly a collection of electron and ions so the mobility of the charge carrier decreases. [19][20] The dielectric loss tangent of BT-CFO/LDPE composite with 4%, 8%, 12%, 16%, and 20% filler concentration from room temperature to 70 C values at a frequency of 40 Hz to 5 MHz is shown in Figure 4A-E respectively. Here the dielectric loss tangent increasing up to 0.07 for 4%, the dielectric loss value rises up to 0.06 value for 8%.…”