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Structural and dielectric properties of Sr4Zn2Fe36O60 U-type hexaferrites with optimized Gd contents and sintered by a two-step process

Idrees, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2022.06.074
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. The structural and dielectric properties of Gadolinium substituted U-type hexaferrites (Sr4Zn2Fe36O60) were investigated. The samples were synthesized via the Sol-gel auto combustion route. In a muffle furnace, these samples were sintered for 5 h at 1250 °C. The pellets of synthesized powder samples were characterized by XRD, PL, Dielectric, FTIR, and Raman spectroscopies. Structural elucidation of Sr4Zn2Fe36-xGdxO60 was done via XRD. The obtained XRD patterns were matched with the prior literature. The impact of Gd3+ substitutions was measured on all the lattice parameters. Lattice constants “a" and “c" were found between 5.871 and 5.900 Å and 111.76–112.23 Å, respectively. The PL spectra of Sr4Zn2Fe36-xGdxO60 demonstrated multiple emissions in the range of 630 nm–700 nm, and by analyzing PL spectroscopic results, a bandgap of 1.8742 eV was found for the un-doped sample. Many dielectric parameters, i.e., Dielectric constant (ε'), Dielectric losses (ε''), Loss tangents (tanδ), Complex electric modulus (M' & M″), and A.C conductivity (σac) were investigated at room temperature by changing the frequencies from 1 GHz to 6 GHz. The varying trends of dielectric parameters were analyzed with the assistance of the Maxwell-Wagner model. Various absorption bands were observed in the range of 500–4000 cm−1 by plotting the FTIR spectroscopic results of Sr4Zn2Fe36-xGdxO60. Raman spectra demonstrated a combination of strong and fragile peaks in 1–1800 cm−1. The obtained results of various spectroscopies suggested that the prepared materials can be used extensively for different Micro-Wave attenuation purposes. © 2022 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Dielectric properties ; Ferrites ; FTIR ; Photo luminance ; Raman spectra ; XRD ; Absorption spectroscopy ; Crystallite size ; Dielectric losses ; Electric fields ; Ferrite ; Ferrites ; Gadolinium ; Iron compounds ; Lattice constants ; Raman scattering ; Sintering ; Sol-gels ; X ray diffraction ; Zinc compounds ; Dielectric parameters ; Dielectrics property ; FTIR ; Gadolinia ; Gd contents ; Photo luminance ; Synthesised ; Two-step process ; U-type hexaferrite ; XRD ; Fourier transform infrared spectroscopy
  8. Source: Ceramics International ; Volume 48, Issue 19 , 2022 , Pages 27739-27749 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0272884222020594