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Structural, magnetic and dielectric properties of Dy-Co substituted Sr-Ba-Mg-based magnetic oxides

Lodhi, M. Y ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1007/s00339-021-05015-5
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2021
  4. Abstract:
  5. In present research six samples of nano X-type hexagonal ferrites with general formula SrBaMg2-xCoxDyyFe28-yO46 (x = 0–1; y = 0–0.1 with step size of 0.2 and 0.02, respectively) were synthesized by sol–gel technique. The temperature required for the phase formation of these materials was estimated using thermogravimetric analysis. X-ray diffraction patterns revealed the pure phase of the prepared materials up to the doping concentration of x = 0.4, y = 0.04 along with the second phase for higher doping concentration. The secondary phase appeared due to the solubility limit of higher ionic radius Dy3+ ions into the hexagonal lattice. The mean crystalline size decreased from 29 to 18 nm while unit cell volume, bulk density, and X-ray density were increased with Dy-Co doping. Hysteresis loops showed that by incorporation of Dy-Co ions the saturation magnetization (Ms) was enhanced from 50 to 60 emu.g−1. Also, coercivity (Hc) varied in the range 1573–3251 Oe, such high values of Ms and Hc propose the utilization of these X-type materials as permanent magnets and perpendicular recording media. The dependence of dielectric parameters (dielectric constant, ac conductivity, Q-value) on frequency (1 MHz–3 GHz) as well as composition was discussed. Inclusion of Dy-Co in X-type lattice modified dielectric parameters i.e. dielectric constant, ac conductivity was increased. Complex modulus studies directed to elucidate Nyquist plots which exhibited a single half-circle for all X-type ferrites, thus depicting Debye sort of behavior. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature
  6. Keywords:
  7. Binary alloys ; Dielectric properties ; Ferrites ; Magnesium compounds ; Saturation magnetization ; Thermogravimetric analysis ; X ray diffraction ; A.C conductivity ; A.c. conductivity ; Ac Conductivity ; Dielectric parameters ; Dielectrics property ; Doping concentration ; Magnetic oxides ; Sol - Gel synthesis ; TGA ; XRD ; Sols
  8. Source: Applied Physics A: Materials Science and Processing ; Volume 127, Issue 11 , 2021 ; 09478396 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s00339-021-05015-5