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오세진,이재영,권순주,유장용,주웅용,Oh, Sei-Jin,Lee, Jae-Yong,Kwon, Soon-Ju,Yoo, Jang-Yong,Choo, Wung-Yong 한국재료학회 2002 한국재료학회지 Vol.12 No.10
Effect of nine different cations to the formation of iron oxyhydroxide was studied using Mossbauer spectroscopy, XRD and BET. The Redox Potential and pH were measured for the determination of the internal reaction rate, as well. The phases of iron oxyhydroxide could not be the same with each other, due to the present of different cations in solution. Although the oxyhydroxide compound were composed of the same phases, the fraction of each phase was different from each other. The internal reaction rate was varied by the substitution of cation. It could be a cause of the different phase and particle size of oxyhydroxide compound.
송하정(Hajung Song),김우진(Woo Jin Kim),권순주(Soon-Ju Kwon) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.4
Colossal magnetoresistance is closely related to (but is not) the abrupt change of electrical resistivity in the vicinity of Curie temperature, which is caused by the temperature dependent paramagnetic-ferromagnetic phase transition and concurrent change of electrical conducting mechanism. A resistivity-temperature equation is presented to fully describe the overall behavior, especially the abrupt change. The main ingredients of the equation are a simple effective media theory and a function for the temperature dependent fraction of ferromagnetic phase. The model fits very well to the measured resistivity-temperature curve of La_(0.7)Ca_(0.3)MnO₃.
뫼스바우어 분광법에 의한 Fe - 나노입자의 탄화물 코팅에 관한 연구
오세진(Sei-Jin Oh),최철진(Chul-Jin Choi),김진천(Jin-Chun Kim),권순주(Soon-Ju Kwon),진상호(SangHo Jin) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.3
Four nano-sized Fe-nano particle samples synthesized by Chemical Vapor Condensation (CVC) were analyzed using Mossbauer spectroscopy, XRD, BET and TEM. The samples were consisted as functions of carrier gas and decomposition temperature. The synthesized nanoparticles consisted of two- or three-layers with the circular shape. The average particle size was increased with increasing the decomposition temperature. At 500℃ for the decomposition temperature, Fe₃C was formed more under the environment of CO carrier gas than that of CH₄. However, at 1,100℃, almost of Fe-nano particles were transformed into Fe₃C with using both carrier gas.
가속전자빔투사에 의한 TiC 강화 철계 표면복합층의 제조 연구
권순주,이성학,추성훈 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.7
Surface composite layers reinforced with TiC particles were fabricated by high-energy accelerated electron beam. TiC powders were mixed with MgO/CaO flux powders with varying the flux mixing ratios of 5, 10, 20, and 40 wt.% to process four kinds of TiC/flux mixtures. The TiC/flux mixtures were deposited evenly on a plain carbon steel substrate, on which electron beam was irradiated to fabricate TiC reinforced surface composite layers. The microstructural analysis was conducted using X-ray diffraction and Mo¨ssbauer spectroscopy as well as optical and scanning electron microscopy. The microstructure of the surface composites was composed of surface composite layer, interfacial region, coarse-grained heat affected zone (HAZ), and finegrained HAZ. A few TiC agglomerates and residual micropores were found in the composite layer of the specimen processed without flux because of density difference, but their number was significantly decreased in the specimens processed with a considerable amount of flux. As a result of irradiation, TiC particles were homogeneously dispersed throughout the composite layer of 2.5 ㎜ in thickness, whose hardness was greatly improved. The proper flux mixing ratio was 10˚-20% to obtain excellent surface composite layers containing homogeneously dispersed TiC particles.