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Mössbauer analysis on the magnetic properties of Fe–Co nanoparticles synthesized by chemical vapor condensation process |
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| Authors: | Sei-Jin Oh Chul-Jin Choi Soon-Ju Kwon Sang-Ho Jin Byoung-Kee Kim Jin-Soo Park |
| Affiliation: | a Department of Acoustics Engineering, JuSeong College, Naesoo-Ub, Chengwon-Kun, Chungbuk 360-172, South Korea b Nanopowder Metallurgy Group, Department of Materials Engineering, 66 Sangnam-Dong, Changwon, Kyungnam 641-831, South Korea c Department of Materials Science and Engineering, Pohang University of Science and Technology, Hoeja-Dong, Nam-Ku, Pohang, Kyungbuk 790-784, South Korea d Department of Electronic Engineering, Chongju University, Naedok-Dong Sangdang-Gu, Chongju, ChungBuk 363-860, South Korea |
| Abstract: | The magnetic properties of Fe–Co nanoparticles synthesized by chemical vapor condensation (CVC) process were investigated. Effect of CVC processing variables on the magnetic properties was analyzed in detail, using Mössbauer spectroscopy, XRD, BET and HRTEM. The synthesized particles were nearly spherical, and their surfaces were identified to be -FeOOH, γ-FeOOH and Fe3O4, but not -Fe2O3. The magnetic properties were strongly influenced by CVC processing parameters. The increase of cobalt content had changed the magnetic property of the sample. However, when the decomposition temperature and the oxygen content in the carrier gas (Ar) were increased, the magnetic property reduced with decreasing the average particle size. Increasing the vacuum pressure in the chamber resulted in that the magnetic field reinforced with the increase of average particle size. |
| Keywords: | Fe–Co nanoparticle Chemical vapor condensation Mössbauer spectroscopy Average particle size Magnetic property Superparamagnetism |
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