کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11015752 | 1781703 | 2019 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Complex permittivity, permeability, magnetic and microwave absorbing properties of Ni2+ substituted mechanically milled U-type hexaferrites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The polycrystalline samples of Ni2+ substituted U-type hexaferrite; (Ba0.7Bi0.2)4(Co1âxNix)2Fe36O60 (0.25â¯â¤â¯xâ¯â¤â¯1.00, in steps of 0.25) were prepared through solid state reaction method. XRD patterns, fitted with Le Bail method, revealed the formation of U-type hexaferrite phase in as-prepared samples. Scanning electron micrograph (SEM) indicates the presence of plate-like hexagonal particles with average sizes of â¼1-4â¯Î¼m. In order to reduce the grain sizes down to nanoscale, two stage high energy mechanical jet milling was performed on xâ¯=â¯0.75 composition sample. The jet milled hexaferrite exhibits relatively smaller grain sizes (â¼20-50â¯nm), lower saturation magnetisation (Msâ¼38.6 emu/g) and higher coercivity (Hcâ¼590.2â¯Oe) in comparison to unmilled sample of same composition (xâ¯=â¯0.75). The jet milled sample, with nanoscale hexaferrite particles, exhibits excellent reflection loss (RL) of â43.8â¯dB (99.99% MW absorption) at 11.3â¯GHz frequency. In addition, the jet milled sample displays a broad frequency bandwidth (â¼8.6â¯GHz) for RLâ¯â¤â¯â10â¯dB (90% MW absorption), extending over â¼9.1-17.7â¯GHz frequency range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 52-60
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 52-60
نویسندگان
Sandeep Kumar, Divya Prakash Dubey, Santiranjan Shannigrahi, Ratnamala Chatterjee,