Microstructure and microwave electromagnetic properties of Dy3+-doped W-type hexaferrites

• Published in: Rare metals Vol. 30; no. 5; pp. 505 - 509
• Main Authors: Wang, Lixi, Huang, Xiaogu, Zhang, Jing, Wang, Hongzhou, Zhang, Qitu, Xu, Naicen
• Format: Journal Article
• Language: English
• Published: Springer Berlin Heidelberg Nonferrous Metals Society of China 01.10.2011; College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China; Jiangsu Provincial Key Laboratory of New Inorganic Materials and Its Composites, Nanjing University of Technology, Nanjing 210009, China%College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China%Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China
• Subjects: Biomaterials; Chemistry and Materials Science; Energy; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; hexaferrites; microwave electromagnetic properties; dysprosium; microstructure; rare earths
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-011-0420-4

Ba 1− x Dy x Co 2 Fe 16 O 27 ( x = 0.00, 0.05, 0.10, 0.15, and 0.20) was prepared by the solid-state method. The phase structure was studied using powder X-ray diffraction (XRD), the electromagnetic properties were measured, and the reflection loss of Dy 3+ -doped ferrite material was calculated using electromagnetic parameters by the transmission line theory. All XRD patterns showed the single phase of the magnetoplumbite barium ferrite without other intermediate phase when x ≤ 0.15. The values of ɛ ′ and ɛ ″ increased slightly with Dy 3+ ions doping. The values of µ″ and µ′ were improved with Dy 3+ doping, exhibiting excellent microwave magnetic performance. The reasons have also been discussed using the electromagnetic theory. Dy substitution could increase microwave-absorbing performance and broaden frequency band (reflection loss (RL) < −10 dB), and the absorbing peak shifted to high-frequency position. When x = 0.2, ferrite layer exhibited the most excellent microwave-absorbing performance at a thin matching thickness of 1.5 mm. The peak value of RL was around −15 dB, and the frequency band (RL < −10 dB) was about 7 GHz (from 8 to 15 GHz).