Effect of Nd-Co substitution on magnetic and microwave absorption properties of SrFe₁₂O₁₉ hexaferrites

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• 作者：Zeyang Zhang^a ; Xiangxuan Liu^a ; ^{xiangxuan_study@yahoo.com} ; Xuanjun Wang^a ; Youpeng Wu^b ; Rong Li^a
• 关键词：Nd&ndash ; Co substitution ; Strontium ferrites ; Magnetic properties ; Microwave absorption
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 June, 2012
• 卷：525
• 期：Complete
• 页码：114-119
• 文件大小：1060 K

摘要

Nd-Co-substituted M-type strontium hexaferrites were prepared by sol-gel-autocombustion method. Crystalline structure, morphology, magnetic properties, and microwave absorption properties of Sr_1鈭?em>xNd_xFe_12鈭?em>xCo_xO₁₉ (x = 0-0.4) were studied via X-ray diffraction, scanning electron microscope, vibrating sample magnetometer, and vector network analyzer, respectively. Single-phase M-type strontium hexaferrites, with a chemical composition of Sr_1鈭?em>xNd_xFe_12鈭?em>xCo_xO₁₉ (x = 0-0.3), were formed by being heated at 1200 藲C for 3 h in air. Saturation magnetization and coercivity reached a maximum at x = 0.2. For samples with x = 0.2, a minimum reflection loss of 鈭?2 dB was obtained at 16.2 GHz for a layer of 1.9 mm in thickness. The reflection loss of Sr_0.8Nd_0.2Fe_11.8Co_0.2O₁₉ ferrite (1.5-3.0 mm in thickness) is less than 鈭?0 dB over the range of 9.8-18 GHz. It indicates that the substituted Nd-Co can greatly improve the microwave absorption properties of SrFe₁₂O₁₉ hexaferrites.