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김동환(D. H. Kim),권혁무(H. M. Kwon),김택기(T. K. Kim),김희태(H. T. Kim),김윤배(Y. B. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
The nitrogenation process and magnetic properties of Sm₂Fe_(17)Nx (0 ≤ x ≤ 3) were investigated. During the initial nitrogenation process, the nitrogen content had linear relation with the square root of nitrogenation time, and the activation energy for the process was calculated to be 102.4 kJ/㏖. The magnetic properties of Sm₂Fe_(17)Nx were strongly dependent on the nitrogen content and the composition having Sm₂Fe_(17)N_(2.8) showed optimum magnetic properties with a Curie temperature of 450 oC. The intrinsic magnetic properties of the nitride at room temperature were Ms = 1147 emu/㎤, K₁ = 4.6 × 10^7 erg/㎤, K₂ = 6.0 × 10^7 erg/㎤ and H_A = 290 kOe, respectively.
(Nd₁-xRx)₂Fe₁₄B (R=Y, Pr)의 자기특성
김만중(M. J. Kim),김윤배(Y. B Kim),김희태(H. T. Kim),김택기(T. K. Kim) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.5
Spin reorientation and magnetocrystalline anisotropy of magnetically aligned (Nd_(1-x)Rx)₂Fe₁₄B (R=Y, Pr) power were studied. The spin reorientation temperature (T_(SR)) of (Nd_(1-x)Pr_x)₂Fe₁₄B decreases linearly by increasing Pr-substitution with the ratio of △T_(SR)=-1.35 K/Pr at.% in composition range of 0≤x≤0.75. The spin reorientation temperature of (Nd_(1-x)Yx)₂Fe₁₄B decreases by increasing Pr-substitution to 118 K (x = 0.5) then increases to 122 K (x = 0.75). The spin reorientation angle at 4.2 K decreases by increasing rare earth substitution with the ratio of △SRA = -0.073°/Y at.% and △SRA = -0.258°/Pr at.% in composition range of 0≤x≤0.5. The spin reorientation is expected to disappear at x≥0.9 in case of (Nd_(1-x)Yx)₂Fe₁₄B and at x≥0.8 in case of (Nd_(1-x)Pr_x)₂Fe₁₄B.
김희태(H. T. Kim),김윤배(Y. B. Kim),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.2
It has been found that the arc-melted NdFe_(10.7)Ti_(1.3) alloy has nearly single phase of ThMn₁₂-type structure (1-12 phase) except the small amount of Fe₂Ti and α-Fe phases. The 1-12 phase forms as square prism of 50 ㎛-100 ㎛ in size, and Fe₂Ti exists between the grain boundaries as particles. Nitrification of this alloy in-creases the unit cell volume, magnetization, anisotropy field and Curie temperature of 1-12 phase. The NdFe_(1.07)Ti_(1.3)Nx, nitrified at 500 ℃ for 15 minutes, shows a magnetization of 128 Am²/㎏, an anisotropy field of about 6400 ㎄/m (80 kOe) and a Curie temperature of 470 ℃.
(Sm0.5RE0.5)Fe₁₁ Ti 화합물의 구조 및 자기특성
김희태(H.T.Kim),김윤배(Y.B.Kim),김창석(C.S. Kim),김택기(T.K. Kim),권혁무(H.M. Kwon) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
(Sm_(0.5)RE_(0.5))Fe₁₁ Ti compounds have tetragonal ThMn₁₂-type structure and show the uniaxial magnetocrystalline anisotropy with the easy magnetization c-axis. Among the (Sm_(0.5)RE_(0.5)Fe₁₁Ti series, RE=Sm shows the highest anisotropy field of 11200 ㎄ / m(140 kOe). On the other hand, RE=Nd has the highest saturation magnetization of 122.3 Am² / ㎏ (122.3 emu / g) and RE=Gd the highest Curie temperature of 326 ℃.