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안성용(Sung Yong An),위성권(Sung Kwon Wi) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.1
ZnO-Bi₂O₃-Al₂O₃-B₂O₃-SiO₂ nano-glass has been prepared by sol-gel method. The mean particle size was 60.3 nm with narrow size distribution. The nano-galss has been used as a sintering aid for the densification of the NiZnCu ferrites. The ferrite was sintered with nano-glass sintering aids at 840~900 ℃, 2 h and the initial permeability, quality factor, density, and saturation magnetization were also measured. The initial permeability of 0.5 wt% nano-glass added toroidal sample for NiZnCu ferrites sintered at 900 ℃ was 193.3 at 1㎒. The initial permeability and saturation magnetization were increased with increasing annealing temperature. As a result, ZnOBi₂O₃-Al₂O₃-B₂O₃-SiO₂ nano-glass systems were found to be useful as sintering aids for multilayer chip inductors.
Cobalt 치환된 칩인덕터용 NiZnCu Ferrite의 자기적 특성 연구
안성용(Sung Yong An),김익섭(Ic Seob Kim),손수환(Soo Hwan Son),송소연(So Yeon Song),한진우(Jin Woo Hahn),최강룡(Kang Ryong Choi) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.5
Effect of cobalt substitution on the sintering behavior and magnetic properties of a NiZnCu ferrite was studied. Ni<SUB>0.36-x</SUB>Co<SUB>x</SUB>Zn<SUB>0.44</SUB>Cu<SUB>0.22</SUB>Fe<SUB>1.98</SUB>O₄ (0≤x≤0.04) ferrite was fabricated by a solid stat reaction method. It was proposed and experimentally verified that Co²? substituted NiZnCu ferrite was effective on improving the quality factor and magnetic properties of NiZnCu ferrites for multilayer chip inductors. The ferrite was sintered without sintering aids, at 880~920℃, for 2 h and the initial permeability, quality factor, density, shrinkage, saturation magnetization, and coercivity were also measured. The quality factor (Q) was increased linearly up to x=0.01 and decreased rapidly over x=0.01. As the cobalt content increased, the initial permeability and density of the ferrites decreases. The initial permeability of toroidal sample for Ni<SUB>0.35</SUB>Co<SUB>0.01</SUB>Zn<SUB>0.44</SUB>Cu<SUB>0.22</SUB>Fe<SUB>1.98</SUB>O₄ ferrites sintered at 900 oC was 130 at 1 ㎒ and quality factor was 230.
ThMn₁₂형 NdFe10.7Ti1.2Mo0.1의 미세구조 및 자기적 성질 연구
안성용(Sung Yong An),이승화(Seung Wha Lee),김철성(Chul Sung Kim),김윤배(Y. B. Kim),김창석(C. S. Kim) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.2
We have studied crystallographic and magnetic properties of NdFe_(10.7)Ti_(1.2)Mo_(0.1) by Mossbauer spectroscopy, X-ray diffraction and vibrating sample magnetometer(VSM). The alloys were prepared by arc-melting under an argon atmosphere. The NdFe_(10.7)Ti_(1.2)Mo_(0.1) has pure a single phase, whereas NdFe_(10.7)Ti_(1.3) contains some α-Fe, conformed with X-ray diffractometry and Mossbauer measurements. The NdFe_(10.7)Ti_(1.2)Mo_(0.1) has a ThMn₁₂-type tetragonal structure with a_0=8.637Å and c_0=4.807Å. The Curie temperature (Tc) is 600 K from the result of Mossbauer measurement performed at various temperatures ranging from 13 to 800 K. Each spectrum of below Tc is fitted with five subspectra of Fe sites in the structure (8i₁, 8i₂, 8j₂, 8j₁, 8f). The area fractions of the subspectra at room temperature are 12.3%, 14.0%, 21.0%, 11.8%, 40.9%, respectively. Magnetic hyperfine fields for the Fe sites decrease in the order, Hhf(8i)>Hhf(8j)>Hhf(8f). The abrupt changes in the magnetic hyperfine field, an magnetic moment observed at about 160 K in NdFe_(10.7)Ti_(1.2)Mo_(0.1) are attributed to spin reorientations. The average hyperfine field of the NdFe_(10.7)Ti_(1.2)Mo_(0.1) shows a temperature dependence of [Hhf(T)-Hhf(0)]/Hhf(0) = -0.34(T/Tc)((3/2)-0.14(T/Tc)^(5/2) for T/Tc<0.7, indicative of spin wave excitation. The Debye temperatures of NdFe_(10.7)Ti_(1.2)Mo_(0.1) is found to be Θ = 340±5 K.
BaFe₁₂-₂xCoxTixO19 분말의 제조 및 자기특성 연구
안성용(Sung Yong An),심인보(In-Bo Shim),김철성(Chul Sung Kim),이승화(Seung Wha Lee) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.1
M-type hexagonal BaFe_(12-2x)Co_xTi_xO_(19) (0≤x≤1.0) ferrite powders prepared by a sol-gel method. The crystallographic and magnetic properties were characterized with a x-ray diffraction (XRD), thermogravimetry (TG), differential thermal analysis (DTA), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), and Mossbauer spectroscopy. The result of XRD measurements show that the a and c lattice parameters increase with increasing x from α=5.882 and c=23.215 Å for x=0.0, to α=5.895 and c=23.295 Å for x=1.0. From the Mossbauer results, the Co²+-Ti⁴+ site occupancies have been affected the changes in the magnetization and in the coercivity. The Curie temperature linearly decreases with increasing Co²+-Ti⁴+ concentration x.
졸겔 합성에 의한 LiFeO₂ 분말의 Mossbauer 연구
안성용(Sung Yong An),김철성(Chul Sung Kim) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.2
α-LiFeO₂ powders have been prepared by a sol-gel method. The crystallographic and magnetic properties were characterized with a x-ray diffractometry, Mossbauer spectroscopy, and vibrating Samples magnetometry. The γ-LiFeO₂+LiFe_5O_8 phase is observed in the Samples annealed at 600 ℃ for 3h in air and α-LiFeO₂ phase is observed in the Samples annealed at 600 ℃ for 3 h in H₂(5%)/Ar(Bal.) gas atmosphere. The crystal structure of α-LiFeO₂ is found to be cubic with a lattice a=4.193±0.0005 Å. The Neel temperature of α-LiFeO₂ is found to be 130±3 K.
졸겔법에 의한 Ba - ferrite 분말의 제조 및 자기적 특성 연구
안성용(Sung Yong An),이상원(Sang Won Lee),최동혁(Dong Hyeok Choi),심인보(In-Bo Shim),김철성(Chul Sung Kim) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.4
M-type hexagonal BaFe₁₂O_(19) ferrite powder was prepared by sol-gel process. The M-type hexagonal structure with α = 5.882 and c = 23.215 Å and its Curie temperature T_C was determined 780±3 K. The isomer shifts of 4f₂, 2α, 4f₁, 12k, and 2b were indicated 0.26, 0.24, 0.15, 0.25, and 0.24 ㎜/s, therefore, the valence states of the Fe ions were ferric (Fe³+). By the law of approach to saturation (LAS), the effective anisotropy field H_A and crystalline anisotropy constant K₁ were estimated. The value of K₁ and H_A were K₁ = 2.5×10^6 erg/㎤ and H_A = 14 kOe, respectively.
칩인덕터용 NiZnCu Ferrite의 자기적 특성 연구
안성용(Sung Yong An),문병철(Byeong Chol Moon),정현철(Hyun Chul Jung),정현진(Hyun Jin Jung),김익섭(Ic Seob Kim),한진우(Jin Woo Hahn),위성권(Sung Kwon Wi) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.2
Ni<SUB>0.4</SUB>Zn<SUB>0.4</SUB>Cu<SUB>0.2</SUB>Fe₂O₄ ferrite was fabricated by solid stat reaction method and sol-gel method. Because of the drawbacks of each method, we combined these two methods together. We proposed and experimentally verified that nanocrystalline ferrite additive was effective on improving the densification behavior and magnetic properties of NiZnCu ferrites for multilayer chip inductors. The initial permeability of the toroidal core Sample with 20 wt% nanocrystalline ferrite increased from 78.1 to 178.2 as annealing temperature is increased from 880 ℃ to 920 ℃. The density, shrinkage and saturation magnetization were increased with increasing annealing temperature, which was attributed to the decrease of additive grain size and increase of sintering density.