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CaCO3 계 Flux Injection 에 의한 용선의 탈황에 대한 연구
민병진,노광현,강길원 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.3
An injection method using CaCO₃powder and other additives as fluxes was employed for the desulfurization of molten pig iron. The results are as follows: 1. The injection method using CaCO₃powder appeared to have a very effective desulfurization by forming the porous and active fine CaO particles and stirring effect due to CO₂gas formed when CaCO₂gas formed when CaCO₃decomposed 2. Partially substituting of CaCO₃with CaO decreased the desulfurization degree as the content of CaO increase. This means that the ability of desulfurization of CaCO₃is superior to CaO. 3. All addition as reduction agent (deoxidizer) improved the desulfurization degree and this is attributed to the promotion of decomposition reaction of CaO into Ca+O by lowering the oxygen chemical potential with formation of Al₂O₃. De-si and de-Mn reaction, however, were suppressed by the Al addition.
11B Nuclear Magnetic Resonance Study of Spin Structures in Terbium Tetraboride
민병진,강기혁,김정훈,현일남,이무희,조병기 한국자기공명학회 2006 Journal of the Korean Magnetic Resonance Society Vol.10 No.2
11B nuclear magnetic resonance (NMR) measurements were performed on the single crystals of TbB4 to investigate local electronic structure and 4f spin dynamics. 11B NMR spectrum, Knight shift, spin-lattice and spin-spin relaxation rates were measured down to 4 K at 8 T. 11B NMR shift and linewidth are huge and strongly temperature dependent due to the 4f moments. In addition, both are proportional to magnetic susceptibility, indicating that the hyperfine field at the boron site originates from the 4f spins of Tb. Below TN, the single broad resonance peak of 11B NMR splits into several peaks reflecting the local magnetic fields due to antiferromagnetic spin arrangements. The longitudinal and the transverse relaxation rates, 1/T1 and 1/T2, independent of temperature above TN, decreases tremendously confirming huge suppression of spin fluctuation below TN. 영어논문