Structural and dielectric properties of Sr4Zn2Fe36O60 U-type hexaferrites with optimized Gd contents and sintered by a two-step process. Issue 19 (1st October 2022)

• Record Type: Journal Article
• Authors: Idrees, Misbah; Khan, Muhammad Azhar; Gulbadan, Shagufta; Mahmood, Khalid; Ashraf, Ghulam Abbas; Akhtar, Majid Niaz
• Is Part Of: Ceramics international. Volume 48:Issue 19(2022)Part A
• Page Start: 27739
• Page End: 27749
• Publication Date: 2022-10-01
• Subjects: Ferrites -- XRD -- Dielectric properties -- FTIR -- Photo luminance -- Raman spectra; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.06.074
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The structural and dielectric properties of Gadolinium substituted U-type hexaferrites (Sr4 Zn2 Fe36 O60) 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 Sr4 Zn2 Fe36-x Gdx O60 was done via XRD. The obtained XRD patterns were matched with the prior literature. The impact of Gd 3+ 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 Sr4 Zn2 Fe36-x Gdx O60 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 Sr4 Zn2 Fe36-x Gdx O60 . 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.