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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Complex permittivity, permeability, magnetic and microwave absorbing properties of Ni2+ substituted mechanically milled U-type hexaferrites
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Complex permittivity, permeability, magnetic and microwave absorbing properties of Ni2+ substituted mechanically milled U-type hexaferrites

机译：Ni2 +取代的机械研磨U型六氧化物的复杂介电常数，渗透性，磁性和微波吸收性能

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The polycrystalline samples of Ni2+ substituted U-type hexaferrite; (Ba0.7Bi0.2)(4)(Co1-xNix)(2)Fe36O60 (0.25 = x = 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 similar to 1-4 mu m. In order to reduce the grain sizes down to nanoscale, two stage high energy mechanical jet milling was performed on x = 0.75 composition sample. The jet milled hexaferrite exhibits relatively smaller grain sizes (similar to 20-50 nm), lower saturation magnetisation (M-s similar to 38.6 emu/g) and higher coercivity (H-c similar to 590.2 Oe) in comparison to unmilled sample of same composition (x = 0.75). The jet milled sample, with nanoscale hexaferrite particles, exhibits excellent reflection loss (R-L) of -43.8 dB (99.99% MW absorption) at 11.3 GHz frequency. In addition, the jet milled sample displays a broad frequency bandwidth (similar to 8.6 GHz) for R-L = -10 dB (90% MW absorption), extending over similar to 9.1-17.7 GHz frequency range. (c) 2018 Elsevier B.V. All rights reserved.
机译：Ni2 +的多晶样品被取代的U型铁氧体; （Ba0.7Bi0.2）（4）（CO1-xNix系）（2）Fe36O60（0.25＆LT; = X＆LT; = 1.00，在0.25以下步骤）通过固相反应法来制备。 XRD图案，配有乐保释方法，揭示的U型铁氧体相的在所制备的样品的形成。扫描电子显微照片（SEM）表示存在板状与相似的1-4微米的平均尺寸的六边形颗粒m。为了降低晶粒尺寸下降到纳米级，进行两个阶段高能机械喷射研磨上X = 0.75样品组合物。喷射研磨六方晶系铁氧体表现出相对较小的晶粒尺寸（类似于20-50纳米），更低的饱和磁化强度（MS类似于38.6鸸鹋/ g）的比较相同组成的未碾磨的样品（x和更高的矫顽力（HC类似于590.2奥斯特） = 0.75）。喷气研磨的样品，具有纳米级颗粒六方晶系铁氧体，在11.3 GHz的频率表现出-43.8分贝（99.99％MW吸收）优异的反射损耗（R-L）。此外，喷射研磨的样品显示宽的频率带宽（类似于8.6千兆赫）为R-L＆LT; = -10分贝（90％MW吸收），延伸在类似于9.1-17.7 GHz频率范围内。 （c）2018年elestvier b.v.保留所有权利。

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