Synthesis, structural investigation, dielectric and magnetic properties of Zn 2+ -doped cobalt ferrite by the sol-gel technique
Zinc substituted cobalt ferrite nanoparticles with elemental composition Co1xZnxFe2O4(x¼0:0, 0.2, 0.4, 0.6) were prepared bythe sol-gel auto-combustion technique using Co, Fe, Zn nitrate as a precursor where nitrates to citrate was 1:3. The as preparedpowder of cobalt zinc ferrite was sintered at 900○C for 3 h. Structural, morphological, dielectric and magnetic properties werestudied by x-ray diffractometer (XRD), scanning electron microscope (SEM), high precision impedance analyzer and vibratingsample magnetometer (VSM), respectively. The peaks obtained from the XRD confirmed samples having crystallite (32–36 nm)single phase inverse spinel structure without any traceable impurity. Lattice parameters were calculated from XRD and it increaseswith Zn content. SEM revealed irregularly shaped grains (0:5–0.7m) morphology with heterogeneous distribution. Thedielectric constant ("0) and dielectric loss (tanδ), have been measured as a function of frequency at room temperature. Thedependence of"0and tanδwith frequency showed the normal dielectric behavior in accordance with the Maxwell-Wagner type ofinterfacial polarization and electron hopping change between Co2þand Co3þas well as between Fe2þand Fe3þions at octahedralsites
Sol–gel; cobalt ferrite; dielectric; magnetic properties.
Mohammad Sajjad Hossain, Md. Badiul Alamy, Mohammad Shahjahan, Most. Hosney Ara Begum, Md. Moazzem Hossain, Suravi Islam, Nazia Khatun, Mukul Hossainz, Mohammad Saiful Alamy and Md. Al-Mamun