Investigation on Optical, Dielectric, and Magnetic Properties of CoAl2-xFexO4 Nanoparticles
| Autor: | D. El-Said Bakeer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Magnetic moment Analytical chemistry Dielectric Condensed Matter Physics Magnetic hysteresis 01 natural sciences Electronic Optical and Magnetic Materials Magnetization Ferromagnetism 0103 physical sciences Dielectric loss 010306 general physics Refractive index Powder diffraction |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 33:1789-1801 |
| ISSN: | 1557-1947 1557-1939 |
| DOI: | 10.1007/s10948-020-05437-x |
| Popis: | In this study, Fe3+ doped cobalt aluminate, CoAl2-xFexO4, x = 0.00, 0.05, 0.10, 0.15, and 0.20, nanoparticles are synthesized via an efficient co-precipitation method. X-ray powder diffraction (XRD) is used to confirm the formation of single-phase cubic spinel structure. Some important optical parameters such as optical band gap Eopt, Urbach energy Eu, and refractive index n are estimated using UV-visible spectra, and their variations with Fe3+ content are discussed. Dielectric studies are carried out for the pelletized samples of CoAl2-xFexO4 nanoparticles at room temperature in the frequency range 50 kHz to 5 MHz. Several important dielectric parameters such as dielectric permittivity (e′), dielectric loss (tanδ), and ac conductivity (σac) of the samples are determined as a function in both frequency and Fe3+ content. The obtained Cole–Cole diagram shows one semicircle corresponding to grain conductions. The magnetic hysteresis (M-H) loop shows ferromagnetic behavior of the samples. The results show that the variation of magnetic parameters depends strongly on Fe3+ content and particle size. Saturation magnetization, magnetic moment, and remnant magnetization increase as the Fe3+ content increases. |
| Databáze: | OpenAIRE |
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