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Effect of Organic Fuel on High-Frequency Magnetic Properties of Fe-Al2O3 Composite Powders Synthesized by a Combustion Method

Title
Effect of Organic Fuel on High-Frequency Magnetic Properties of Fe-Al2O3 Composite Powders Synthesized by a Combustion Method
Author
김종렬
Keywords
Combustion; Fe-AI2O3 composite powders; high-frequency soft-magnetic property; soft-magnetic composite
Issue Date
2015-11
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON MAGNETICS, v. 51, No. 11
Abstract
Nanocrystalline Fe-Al2O3 soft-magnetic composite powders were synthesized by a conventional combustion method followed by a H-2 reduction process. In this paper, we analyzed the effect of the types and compositions of organic fuel on the dispersive magnetic properties of the composite powders for improving the soft-magnetic properties. To understand the properties, the microstructural and thermal characterization of as-synthesized oxide powders and their reduced powders were analyzed by an X-ray diffractor, a scanning electron microscope, and a thermogravimetric and differential thermal analyzer. In addition, the high-frequency dispersive magnetic simulation using the Landau-Lifshitz-Gilbert (LLG) equation and extended Maxwell-Garnet effective medium theory mixing rule was carried out. As a result, the microstructural and thermal analyses showed that the high-frequency dispersive magnetic behaviors of nanocrystalline Fe-Al2O3 composite powders were dependent on the types and the compositions of fuel by controlling the released heat amount during the combustion redox reaction. In particular, a relative real permeability (u(r)'# of 3#6 at 1 GHz was obtained in Fe-Al2O3 #Fe: Al = 95: 5, wt%# composite powders combusted by a mixed fuel composed of a 50 mol% glycine and a 50 mol% urea.
URI
http://ieeexplore.ieee.org/document/7117416/http://hdl.handle.net/20.500.11754/36573
ISSN
0018-9464; 1941-0069
DOI
10.1109/TMAG.2015.2441115
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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