ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Al-substituted Mg nanoferrite structural, optical and electromagnetic behaviour prepared via citrate gel auto-combustion method

Boda Mahipal, Nakiraboina Venkatesh, D. Ravi Kumar, and P. Veerasomaiah

Department of Chemistry, University College of Science, Osmania University, Hyderabad, India

E-mail: vs_puppala@rediffmail.com

Received: 4 November 2022  Accepted: 3 January 2023

Abstract:

From the citrate gel auto-combustion method, spinal ferrite of Al-substituted Mg nanoferrites has been synthesized. Structural, optical, and electromagnetic behaviours were reported by XRD, UV–Vis, dielectric studies, and VSM, respectively. According to XRD analysis, the phase of the nanoferrites belongs to the FD₃M space group and has a crystalline size of 14–25 nm. The lattice constant is found to be 7.841–8.296 A^o. The FTIR spectral bands appearing in the 600 & 400 cm⁻¹ wavenumber regions indicate that the prepared sample has a tetrahedral (A site) and octahedral (B site) structure, respectively. In the Raman spectra, five active modes (A_1g + E_g + 3T_g) were observed, which would be expected in the spinel ferrite system. The optical band gap energy was obtained from the UV–visible spectrum and found to be 3.43 to 3.49 eV. The effects of aluminium substitution on AC conductivity, impedance analysis, dielectric constant, and loss were investigated. The AC conductivity increased with applied frequency and temperature, whereas the dielectric constant and loss decreased, which phenomenon was explained by the Maxwell–Wagner polarization theory. Single semi-circle behaviour is observed in the impedance spectrum.

Keywords: MgAlXFe2-XO4; XRD; FE-SEM; Raman; Fluorescence; VSM; Dielectric studies

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-02670-1

Chemical Papers 77 (5) 2839–2858 (2023)