Date/Time: 04-23-2019 - Tuesday - 05:00 PM - 07:00 PM
Tamanna Mariam1 Kazi Hanium Maria2 Nazrul Islam Khan3 Shamima Choudhury2

1, University of Toledo, Toledo, Ohio, United States
2, University of Dhaka, Dhaka, , Bangladesh
3, Bangladesh Atomic Energy Center, Dhaka, , Bangladesh

A series of Co1-xZnxFe2O4 ferrite with (x=0.0, 0.1, 0.2, 0.3, 0.4, 0.5) compositions were synthesized using the standard double sintering ceramic technique, sintered at 1050°C for 2 hours. Substituting Zn in place of Co influenced the structural, dielectric and magnetic properties of CoFe2O4 samples. Structural analyses were carried out using X-ray diffraction (XRD). The X-Ray diffraction pattern confirmed the single-phase cubic spinel structure and the sharp peak revealed that the samples are in good crystalline form. The lattice parameters were calculated for each composition and found to increase with Zn substitution. A significant increase in density and subsequent decrease in porosity was observed with increasing Zn content. The grain size of the samples was reduced by enhancing the Zn concentration. The dielectric constant (ε′) of the sample is found to decrease with increase in frequency exhibiting normal dielectric behavior. Dielectric relaxation peaks were observed for the frequency dependence of dielectric loss tangent curves. The observed dielectric properties were explained on the basis of electron conduction mechanism. The variation of the resistivity versus temperature was also studied and the dielectric constant of the system has a variation quite similar to that of the resistivity. VSM measurement confirmed that the magnetizations of all the samples were saturated. Saturation magnetization and coercivity were estimated with variation of Zn content. These effects are due to facilitation of demagnetization by substitution of the non-magnetic Zn ions. Permeability was found to decrease with increasing in Zn content. The characteristics of electromagnetism, excellent chemical stability, mechanical hardness, low coercivity, moderate saturation magnetization and high anisotropy constant suggested Cobalt Ferrite a good candidate for synthesizing and investigation to contribute as dielectric, magnetic, multiferroic material and in storage devices for the advancement of science and technology.

Meeting Program

Symposium Sessions

5:00 PM–7:00 PM Apr 23, 2019 (US - Arizona)

PCC North, 300 Level, Exhibit Hall C-E