A comparative study of Ku-band absorption characteristics and analysis of structural properties of Ba1-xGdxFe12O19 (0.00≤x≤0.50) samples

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-03-22 DOI:10.1016/j.matchemphys.2025.130771

Garima Sharda , Pawandeep Kaur , Sandeep Sharma , Anupinder Singh , Paramjeet Kaur , Sachin Kumar Godara , Jahangeer Ahmed , Saad M. Alshehri , Abhishek Kandwal , Mandeep Singh

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引用次数: 0

Abstract

The solid state method was utilized to prepare Ba_1-xGd_xFe₁₂O₁₉ (0.00 ≤ x ≤ 0.50) samples. The XRD (profile matching) data indicated the presence of additional impurity (Fe₂O₃ and Gd₃Fe₂Fe₃O₁₂) phases besides the M-type Ba_1-xGd_xFe₁₂O₁₉ phase for x > 0.10. The concentration of M-type phase decreased from 100 % (at x = 0.00) to 40.69 % (at x = 0.50). The XRD data hence shows the multiphase nature of these samples. FESEM data established average grain size ≈0.75 μm in x = 0.20 and 0.40 samples. VNA data shows that ε′ and μ′ spectra are complementary to each other. Highest K_u-band response (

R L (d B)

) has been observed for the x = 0.1 sample. For this sample a

R L (d B)

value ≈ −18.12 dB has been observed at 12.40 GHz. The x = 0.5 sample exhibits insufficient microwave response (

R L (d B

= - 9.79 > −10 dB). Highest bandwidth (≈4.43 GHz) has been observed for x = 0.30 sample. The

R L (d B)

data suggests effective microwave response for x ≤ 0.40 samples. Further, the

R L (d B)

data corroborates nicely with the impedance matching data. The varying values of C₀ parameter with frequency suggest that natural resonance is responsible for magnetic losses in these samples. The total shielding effectiveness of various samples varies between 16.90 dB (for x = 0.50) and – 19.44 dB (for x = 0.00).

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.