Structural, infrared, magnetic and microwave absorption properties of rare earth doped X-type hexagonal nanoferrites

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• 作者：Imran Sadiq^a ; ^{khanphysics@yahoo.com} ; Imran Khan^a ; Evgeny V. Rebrov^b ; Muhammad Naeem Ashiq^c ; Shahzad Naseem^d ; M.U. Rana^a ; ^{mazharrana@bzu.edu.pk}
• 关键词：Ceramics ; Sol&ndash ; gel process ; X-rays diffraction ; Magnetic measurements
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：5 September, 2013
• 年：2013
• 卷：570
• 期：Complete
• 页码：7-13
• 全文大小：1041 K

文摘

A series of Sr_2?xNd_xNi₂ Fe_28?yCo_yO₄₆ (x = 0.02, 0.04, 0.06, 0.08, 0.10 and y = 0.1, 0.2, 0.3, 0.4, 0.5) X-type hexagonal ferrites has been prepared by sol-gel method at 1250 ¡ãC for 6 h. XRD analysis shows the single phase of the prepared ferrites material. The lattice constant values and c/a ratio shows that the present assembled material belongs to the family X-type hexagonal ferrites. The peaks in the FTIR spectra are the characteristics of the hexagonal ferrites. The crystallite size measured by Scherer formula is in good agreement with the crystallite size measured by TEM and HRTEM. The enhancement in the magnetic properties can easily be observed with the doping of rare earth element Nd³⁺ and divalent Co²⁺. Due to high saturation and low coercivity values the present material can be good microwave absorber. The temperature dependent saturation and remanance magnetization decreases monotonically with temperature. The minimum value of reflection loss enhances with the substituent and the attenuation constant results are in agreement with reflection loss results.