Structural, electromagnetic, and Ku-band absorption characterization of La-Mg substituted Y-type barium hexaferrite for EMI shielding application

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 283; p. 115801
• Main Authors: Suthar, Mukesh, Roy, P.K.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.09.2022; Elsevier BV
• Subjects: Barium; Barium hexaferrite; Ceramics; Densification; Electromagnetic shielding; EMI shielding; Fourier transforms; Frequency ranges; Grain size; Ku-band absorption; Lanthanum; La–Mg substitution; Magnesium; Materials substitution; Network analysers; Permeability; Permittivity; S parameters; Sol-gel processes; Superhigh frequencies; Synthesis; Y-type barium hexaferrite; La–Mg substitution; Ku-band absorption; Y-type barium hexaferrite; Permeability; Permittivity; EMI shielding
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2022.115801

[Display omitted] •Synthesized Ba2-xLaxCo2-xMgxFe12O22 (0 ≤ x ≤ 0.5) Y-type hexaferrite by auto combustion.•Visualized the effect on structural, electromagnetic, and EMI shielding properties.•Found enhanced magnetic anisotropy with high attenuation of an incident wave.•Achieved total shielding effectiveness of about 10.29 dB at 12.5 GHz.•Total shielding efficiency is dependent primarily on the absorption mechanism.•Ba1.5La0.5Co1.5Mg0.5Fe12O22 showed the best microwave absorption with RL < -10 dB. This work describes the synthesis and characterization of lanthanum and magnesium substituted Y-type barium hexaferrite to examine its potential as an EMI shielding material in Ku-band frequency. The structural, electromagnetic, and EMI shielding properties of La–Mg substituted Y-type barium hexaferrite, Ba2-xLaxCo2-xMgxFe12O22, where ×  = 0.1, 0.2, 0.3, 0.4, & 0.5, synthesized by the sol–gel auto-combustion method, were investigated. The synthesized ceramics were sintered at 1050 °C for 2 hrs.The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were employed to characterize the ceramics. The grain size and densification were dropped while the permeability and permittivity were improved with the increasing concentration of La-Mg. The scattering parameters (S11, S21, S12, and S22) of the ferrite samples were measured in the Ku-band frequency range (12.3–17.5 GHz), and their electromagnetic shielding properties were studied using a vector network analyzer (VNA). The investigation of shielding effectiveness depicted the increment of reflective shielding efficiency (SER) and better overall shielding efficiency (SET) with the increasing La-Mg concentrations. Based on the obtained results, Ba1.5La0.5Co1.5Mg0.5Fe12O22 ferrite showed the best candidacy for electromagnetic suppression or other high-frequency applications.