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Structural, spectral, dielectric and magnetic properties of Sr2CuxNi2-xFe28-xCrxO46 (0 ≤ x ≥ 0.5) ferrites synthesized via micro-emulsion route
Materials Chemistry and Physics ( IF 4.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.matchemphys.2020.124066
Muhammad Azhar Khan , Muhammad Qamar uz Zaman , Abdul Majeed , Majid Niaz Akhtar , Waseem Abbas

Abstract In the present study, Sr2CuxNi2-xCrxFe28-xO46 where (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) X-type ferrites were fabricated by micro-emulsion procedure. X-ray diffraction technique assured the phase of fabricated ferrites to be that of pure X-type ferrites. The reduction in lattice constants (a & c) seemed with the incorporation of Cr3+-Cu2+ metals. The crystalline size of the synthesized materials was obtained in 19-23 nm range, using the Scherer's formula. The iron-oxygen bands of X-type hexagonal ferrites at tetrahedral and octahedral sites were confirmed from FTIR spectra. The FTIR spectra also showed the strong influence of Cr3+-Cu2+ substitution, which confirmed that the dopants have a meaningful role in these ferrites. The dielectric parameters were explored in a large frequency range (i.e. from 1 MHz to 3GHz) and these parameters showed significant variations with Cr3+-Cu2+ doping contents. Moderate values of dielectric constant, low tangent loss, high Q values, and significant response to the high frequency of these X-type ferrites ensured their applicability for the high (GHz) frequency applications. Vibrating sample magnetometry technique (VSM) was applied to unfold the magnetic parameters. The Coercivity (Hc), saturation magnetization (Ms) as well as remanence magnetization (Mr) revealed considerable variations with doping Cr3+-Cu2+cations. The enhancement in magnetic parameter i.e. coercivity Hc with the doping of Cr3+-Cu2+ reflects the uses of these materials in longitudinal recording media.

中文翻译:

通过微乳液法合成的 Sr2CuxNi2-xFe28-xCrxO46 (0 ≤ x ≥ 0.5) 铁氧体的结构、光谱、介电和磁性能

摘要 在本研究中,Sr2CuxNi2-xCrxFe28-xO46 其中 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) X 型铁氧体是通过微乳液工艺制备的。X 射线衍射技术确保制造的铁氧体的相位为纯 X 型铁氧体的相位。晶格常数 (a & c) 的降低似乎与 Cr3+-Cu2+ 金属的结合有关。合成材料的晶体尺寸在 19-23 nm 范围内使用 Scherer 公式获得。X 型六方铁氧体在四面体和八面体位点的铁氧谱带由 FTIR 光谱证实。FTIR 光谱还显示出 Cr3+-Cu2+ 取代的强烈影响,这证实了掺杂剂在这些铁氧体中具有重要作用。在大频率范围内探索介电参数(即 从 1 MHz 到 3GHz),这些参数显示出随 Cr3+-Cu2+ 掺杂含量的显着变化。这些 X 型铁氧体具有适中的介电常数值、低切线损耗、高 Q 值以及对高频的显着响应,确保它们适用于高 (GHz) 频率应用。应用振动样品磁力计技术(VSM)来展开磁参数。矫顽力 (Hc)、饱和磁化强度 (Ms) 以及剩磁 (Mr) 显示出随着掺杂 Cr3+-Cu2+ 阳离子的显着变化。掺杂 Cr3+-Cu2+ 后磁参数即矫顽力 Hc 的增强反映了这些材料在纵向记录介质中的用途。这些 X 型铁氧体对高频的显着响应确保了它们在高频 (GHz) 应用中的适用性。应用振动样品磁力计技术(VSM)来展开磁参数。矫顽力 (Hc)、饱和磁化强度 (Ms) 以及剩磁 (Mr) 显示出随着掺杂 Cr3+-Cu2+ 阳离子的显着变化。掺杂 Cr3+-Cu2+ 后磁参数即矫顽力 Hc 的增强反映了这些材料在纵向记录介质中的用途。这些 X 型铁氧体对高频的显着响应确保了它们在高频 (GHz) 应用中的适用性。应用振动样品磁力计技术(VSM)来展开磁参数。矫顽力 (Hc)、饱和磁化强度 (Ms) 以及剩磁 (Mr) 显示出随着掺杂 Cr3+-Cu2+ 阳离子的显着变化。掺杂 Cr3+-Cu2+ 后磁参数即矫顽力 Hc 的增强反映了这些材料在纵向记录介质中的用途。饱和磁化强度 (Ms) 以及剩磁磁化强度 (Mr) 显示出随着掺杂 Cr3+-Cu2+ 阳离子的显着变化。掺杂 Cr3+-Cu2+ 后磁参数即矫顽力 Hc 的增强反映了这些材料在纵向记录介质中的用途。饱和磁化强度 (Ms) 以及剩磁磁化强度 (Mr) 显示出随着掺杂 Cr3+-Cu2+ 阳离子的显着变化。掺杂 Cr3+-Cu2+ 后磁参数即矫顽力 Hc 的增强反映了这些材料在纵向记录介质中的用途。
更新日期:2021-02-01
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