Optimized electromagnetic shielding properties using bismuth-doped barium hexaferrite nanoparticles

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Polyhedron Pub Date : 2024-12-31 DOI:10.1016/j.poly.2024.117384

Neha Thakur , Indu Sharma , Prashant Thakur , Khalid Mujasam Batoo , Sagar E. Shirsath , Gagan Kumar

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Abstract

Bismuth-doped M-type Barium hexagonal ferrite nanoparticles were prepared through the citrate-precursor route to examine their electromagnetic shielding properties. X-ray diffraction and Rietveld refinement confirmed the single-phase nature of the sample with a hexagonal structure having space group P₆₃/mmc. Raman spectroscopy shows the presence of peaks at 172, 218, 285, 320, 405, 514, 604, and 677 cm⁻¹ corresponding to various vibrations, including E_1g, A_1g, and E_2g symmetries, and indicate octahedral and bipyramidal site interactions. UV–visible spectroscopy showed that increasing Bi²⁺ content decreased the band gap values from 1.5 eV to 1.49 eV. Field Emission Scanning Electron Microscopy and Transmission Electron Microscopy showed increased grain size with increasing Bi²⁺ doping and lies between 97 to 107 nm. Magnetic studies identified ferromagnetic behaviour with a significant coercivity (Hc) in the doped samples. Composition Bi_0.3Ba_0.7Fe₁₂O₁₉ with a 3 mm thickness showed a maximum reflection of −15.24 dB with 54.91 dB absorption of 11.05 GHz frequency range. The sample’s remarkable reflection and higher absorbance frequencies make it an appropriate material choice for future radar applications, particularly within the X-band frequency range (8–12 GHz).

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.