Cobalt doping of nickel ferrites via sol gel approach: effect of doping on the structural and dielectric properties
| Autor: | Maha M. Almoneef, Munawar Iqbal, Ismat Bibi, Muhammad Danish Ali, Farzana Majid, Sadia Ata, Adnan Ali, Ijaz Ul Mohsin, Arif Nazir, Seemab Dildar, Saba Irshad |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Doping chemistry.chemical_element 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Nickel chemistry Chemical engineering Physical and Theoretical Chemistry 0210 nano-technology Cobalt Sol-gel |
| Zdroj: | Zeitschrift für Physikalische Chemie. 235:1811-1829 |
| ISSN: | 2196-7156 0942-9352 |
| DOI: | 10.1515/zpch-2021-3006 |
| Popis: | Cobalt doped nickel ferrites were fabricated by sol gel route and the dielectric constant, tangent loss and AC conductivity were investigated as a function of Co doping. The X-ray diffractometer characterization confirmed that the Co x Ni1−x Fe2O4 with doping concentration (x = 0.1, 0.2, 0.3, 0.4, and 0.5) have cubic spinel structure. In the XRD spectrum there appear extra peaks of Fe2O3 as an impurity that is gradually disappear by increasing doping ratio of cobalt ions, which is an indication of high crystallinity. The structural parameters (lattice constant, grain size, dislocation density, X-rays density and packing factor) are greatly influenced by the doping of cobalt atoms i.e., lattice constant increases. The crystal size increases from 30 to 42.26 nm by cobalt substitution in the pure nickel ferrites. The Fourier Transform IR Spectroscopy indicate shift in peaks to lower frequency region because cobalt doping reduced binding energy between metal ion and oxygen ions. Atomic structure of cobalt doped nickel ferrites examined by the Raman spectroscopy. Co x Ni1−x Fe2O4 shows Raman mode at ∼285, ∼477, ∼563, ∼624 and ∼704 cm−1. There is unnoticeable Raman shift due to the doping of cobalt’s atoms. |
| Databáze: | OpenAIRE |
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