Magnetic Properties of Sodium-Modified Iron-Oxide Powders Synthesized by Sol-Gel Method
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概要
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Spinel-type ferrites of the sodium-modified iron-oxide (Na-Fe-O) system were synthesized by using a sol-get method. The maximum magnetic moment of 50 emu/g was obtained at the sodium concentration of C_<Na>= 0.1 to 0.2 (the mol ration of sodium to the sum of sodium and iron), which is about 1.5 times larger than that of non-substituted ones. Monotropic phase transition temperature from the γ-Fe_2O_3 phase to the α-Fe_2O_3 phase was shifted to higher temperature by substituting a small amount of sodium and the highest transition temperature reaches as high as about 600℃ for C_<Na>=0.2, where the crystal structure of spinel was maintained except elongation of the lattice parameter, which results in the decreases of Curie temperature and magnetic hyperfine field. Improvement in thermal stability of γ-Fe_2O_3 is considered to be due to the formation of sodium-modified γ-Fe_2O_3.
- 社団法人応用物理学会の論文
- 1991-03-15
著者
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山口 浩一
電気通信大学電子工学科
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Matsumoto K
Electrotechnical Lab. Ibaraki‐kenn Jpn
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Matsumoto Kazuhiko
Electrotechnical Laboratory (etl)
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Matsumoto Kazuhiko
Advanced Industrial Science And Technology:tsukuba University:crest
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FUJII Toshitaka
Department of Electrical & Electronic Engineering, Toyohashi Univerxity of Technology
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Fujii Toshio
Fujitsu Laboratories Lid.
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Yamaguchi Katsumi
Department Of Mechanical Engineering Nagoya University
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Matsumoto Kazuhisa
Sumitomo Electric Industries Ltd.
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Yamaguchi Kazuhiro
Department Of Medicine School Of Medicine Keio University
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山口 浩一
電気通信大学電気通信学部電子工学科
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YAMANOBE Yasunori
Department of Electrical and Electronic Engineering, Toyohashi University of Technology
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Matsumoto Koji
Department Of Obstetrics And Gynecology Graduate School Of Comprehensive Human Science University Of
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Yamanobe Yasunori
Department Of Electrical And Electronic Engineering Toyohashi University Of Technology
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Matsumoto Koji
Department Of Electrical And Electronic Engineering Toyohashi University Of Technology:(present Addr
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Fujii Toshitaka
Deparment Of Electrical Engineering And Electronics Toyohashi University Of Technology
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Yamaguchi Kazuhiro
Department Of Applied Chemistry Facutly Of Engineering Utsunomiya University
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