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노태환,강일구 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.3
The effect of low-temperature annealing on magnetic properties has been investigated in order to clarify the structural relaxation of a metal-metalloid type amorphous alloy, For amorphous Fe_(33)Ni_(50)P_(17) alloy, the saturation magnetization at T= OK was estimated to be almost not affected by annealing at 450k for 3hr indicating the little change of the neighbouring metalloid surroundings. The Curie temperature increased with In t_a kinetics for Fe_(33)Ni_(50)P_(17) alloy annealed at 400-450 K. From the composition dependence of the Curie temperature for amorphous (Fe_(1-x)Ni_x)_(83)P_(17) alloys (x=0-0.6), the increase in Curie temperature was interpreted to originate from the coupling between Fe and Ni atoms. The activation energy for the low-temperature relaxation causing the change in Curie temperature was about 1.3eV.
Fe_(73.5)Cu₁Nb₃Si_(13.5)B_(9) 초미세 결정립 합금의 분말코아 특성
노태환,최혁열 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.6
The melt-spun Fe_(73.5)Cu₁Nb₃Si_(13.5)B_(9) ribbons so called Finemet alloy were annealed in the temperature range of 490 to 610℃ for 1 h and milled by using a planetary ball mill into the powders with the size of 250~850 sm. Then the powder cores were produced through the blending of the magnetic powders with the 5 wt% of ceramic insulator and cold compaction. Further the annealing responses of magnetic, electrical properties and microstructure were investigated. At the annealing temperature of 550℃, the microstructure was transformed from amorphous to crystalline a-Fe phase with the grain size of 10.7 nm, and the electrical resistivity of 117 μΩ-㎝ was obtained. At the same time, the effective permeability and quality factor reached 120 and 50, respectively, and the permeability persisted up to about 500 kHz. Moreover the core loss at the frequency of 50 kHz and the magnetic induction of 0.1 T was about 300 mW/cm³. These magnetic properties were comparable to the conventional powder core materials such as MPP(molybdenum permalloy powder), Sendust etc. However the dc bias characteristics represented by the permeability stability upon dc magnetic field superposition were found to be unsatisfactory. (Received February 16, 2004)
제일원리계산방법에 의한 결정 구조에 따른 덩치 망간의 전자 구조와 자성 변화 연구 : 면심입방과체심입방 구조의 망간 fcc and bcc Mn
노태환,홍순철 울산대학교 2002 자연과학논문집 Vol.11 No.2
덩치 망간의 평형상태에서의 결정구조와 자성 구조는 아주 복잡한 것으로 알려져 있다. 본 연구에서는 자성 연구에서 가장 적합한 방법으로 알려져 있는 Full-potential Linearized Augmented Plane Wave(FLAPW) 방법을 사용하여 격자상수의 함수로 면심입방 Mn과 체심입방 Mn의 계산 가능한 자성 상태(상자성, 강자성, 반강자성 상태)의 총에너지를 계산하여 결정구조에 따른 Mn의 자성 변화를 연구하였다. 계산 결과, 면심입방 Mn은 반강자성 상태가 안정하고 체심입방 Mn은 강자성상태가 안정한 것으로 밝혀졌다. 면심입방 Mn과 체심입방 Mn의 평형상태의 격자상수는 각각 6.750, 5.314 a.u. 이었고 자기모멘트는 1.15 μ_B과 0.85 μ_B인 것으로 계산되었다. 면심입방의 경우는 강자성 상태가, 체심입방의 경우는 반강자성 상태가 전혀 안정되지 못하는 것으로 나타났다. Manganese is known to have a very complicated crystal structure due to its complex magnetism. In this study we investigated the magnetism of fee and bcc Mn as functions of lattice constants, using Full-potential Linearized Augmented Plane Wave(FLAPW) method and assuming para-, ferro-, and antifcrro-magnetic states. The anti ferromagnetic and ferromagnetic states were calculated to be energetically stable for fee Mn and bcc Mn, respectively. The lattice constants of fee and bcc Mn at equilibrium are 6.750 and 5.314 a.u. and the magnetic moments are 1.15 and 0.85 μ_B, respectively. The ferro- and antiferro-magnetic states are so unstable (not even metastable) that the states were converged to the other magnetic states in self-consistent calculations.
노태환,이영아,이지은,이심성,정옥상,Jung Woon Lee 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.3
Reaction of AgNO₃with triethanolaminetriisonicotinate (L) produces 1 D coordination polymer of [Ag₃(L)₂](NO₃)₃and the same treatment of Cu(NO₃)₂with L gives 1D coordination polymer of [Cu(L)₂](NO₃)₂. The nonrigid triethanolaminetriisonicotinate acts as a m 3-bridged tridentate for [Ag₃(L)₂](NO₃)₃and a μ₂-bridged bidentate for [Cu(L)₂](NO₃)₂ to produce unusual motifs. The NO₃- anions can be smoothly exchanged by PF6- anions in an aqueous suspension without destruction of the skeletal structure.
노태환,정옥상,Youn Jung Choi,하병조,Jong Sung Jin 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.11
N,N-Bis[2-(isonicotinoyloxy)ethyl]-p-toluenesulfonamide (L) as a new ligand was synthesized and characterized. The photoluminescence spectrum of L shows a bright blue emission at 417 nm. The slow diffusion of an organic solution of L into an aqueous solution of AgX (X = BF4 − and ClO4 −) affords a metallacyclodimer consisting of [Ag(L)]2X2. Each L acts as a bidentate fashion, and thus connects two Ag(I) ions to form the metallacyclodimer. For [Ag(L)]2(BF4)2, the BF4 − anions are positioned around Ag(I) ion, and for [Ag(L)]2- (ClO4)2, the ClO4 − anions are positioned at the metallacyclodimeric ring. The delicate difference between both structures in solid state can be explained by the coordinating ability of anions.
노태환,No, Tae-Hwan 전국농업기술자협회 2012 농업기술회보 Vol.49 No.4
벼 흰잎마름병은 벼에 발생하는 중요한 세균병 중 하나로 우리나라 벼 재배에서 가장 큰 피해를 주고 있다. 한 번 발생하면 치료가 힘든 병으로 알려져 있어 예방위주로 철저히 방제해야 수량감소와 쌀의 품질저하를 막을 수 있다.