Structural, spectral, dielectric and magnetic properties of Sr2CuxNi2-xFe28-xCrxO46 (0 ≤ x ≥ 0.5) ferrites synthesized via micro-emulsion route

• Published in: Materials chemistry and physics 2021-02, Vol.259, p.124066, Article 124066
• Main Authors: Khan, Muhammad Azhar, Qamar uz Zaman, Muhammad, Majeed, Abdul, Akhtar, Majid Niaz, Abbas, Waseem
• Format: Article
• Language: English
• Subjects: Coercivity; Copper; Dielectric measurements; Doping; Ferrites; Frequency ranges; Lattice parameters; Longitudinal recording media; Magnetic measurement; Magnetic properties; Magnetic saturation; Magnetic storage; Magnetic studies; Magnetization; Q values; Recording instruments; Remanence; Spectra; Spectroscopic studies; Synthesis; Trivalent chromium; XRD
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2020.124066

In the present study, Sr2CuxNi2-xCrxFe28-xO46 where (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) X-type ferrites were fabricated by micro-emulsion procedure. X-ray diffraction technique assured the phase of fabricated ferrites to be that of pure X-type ferrites. The reduction in lattice constants (a & c) seemed with the incorporation of Cr3+-Cu2+ metals. The crystalline size of the synthesized materials was obtained in 19–23 nm range, using the Scherer's formula. The iron-oxygen bands of X-type hexagonal ferrites at tetrahedral and octahedral sites were confirmed from FTIR spectra. The FTIR spectra also showed the strong influence of Cr3+-Cu2+ substitution, which confirmed that the dopants have a meaningful role in these ferrites. The dielectric parameters were explored in a large frequency range (i.e. from 1 MHz to 3 GHz) and these parameters showed significant variations with Cr3+-Cu2+ doping contents. Moderate values of dielectric constant, low tangent loss, high Q values, and significant response to the high frequency of these X-type ferrites ensured their applicability for the high (GHz) frequency applications. Vibrating sample magnetometry technique (VSM) was applied to unfold the magnetic parameters. The Coercivity (Hc), saturation magnetization (Ms) as well as remanence magnetization (Mr) revealed considerable variations with doping Cr3+-Cu2+cations. The enhancement in magnetic parameter i.e. coercivity Hc with the doping of Cr3+-Cu2+ reflects the uses of these materials in longitudinal recording media. •Sr2CuxNi2-xCrxFe28-xO46 X-type ferrites were prepared micro-emulsion route.•The crystallite size is found in the range 19–23 nm.•FTIR spectra unveiled strong influence of Cr3+-Cu2+ substitution.•Coercivity of these materials reflects their use in longitudinal recording media.