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임정태(Jung Tae Lim),김진모(Chin Mo Kim),김철성(Chul Sung Kim) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.1
Ba<SUB>2</SUB>Mg<SUB>0.5</SUB>Co<SUB>1.5</SUB>(Fe<SUB>0.99</SUB>In<SUB>0.01</SUB>)<SUB>12</SUB>O<SUB>22</SUB> was prepared by the conventional solid-state reaction method, and studied by x-ray diffractometer, vibrating sample magnetometer, and Mossbauer spectrometer. The crystal structure was determined to be a single-phased rhombohedral with space group R-3m. Magnetization value were M<SUB>s</SUB> = 28.6 emu/g at 295 K. The hysteresis loops indicate that all the samples are ferrimagnetic behaviors. Mossbauer spectra of Ba<SUB>2</SUB>Mg<SUB>0.5</SUB>Co<SUB>1.5</SUB>(Fe<SUB>0.99</SUB>In<SUB>0.01</SUB>)<SUB>12</SUB>O<SUB>22</SUB> have been 6-sextet taken at various temperatures ranging from 4.2 to 620 K. Based on the isomer shift (δ) values of all samples, the charge states were found to be Fe<SUP>3+</SUP> state at all temperatures, the Curie temperature was determined to be 630 K by the ZVC curve.
소결 조건에 따른 Y-type Hexaferrite의 고주파 특성
임정태(Jung Tae Lim),김철성(Chul Sung Kim) 한국자기학회 2014 韓國磁氣學會誌 Vol.24 No.2
The samples of Ba₂CoZnFe<SUB>12</SUB>O<SUB>22</SUB> was synthesized by the solid-state reaction method. The toroids of Ba₂CoZnFe<SUB>12</SUB>O<SUB>22</SUB> were sintered with various sintering temperature at 1050, 1100, 1150, and 1200 ℃, and studied by x-ray diffractometer, vibrating sample magnetometer, network analyzer, and Mssbauer spectrometer. From the XRD patterns, the density of samples increased with increasing sintering temperature. From the magnetic hysteresis curves up to 10 kOe at 295 K, the saturation magnetization (M<SUB>s</SUB>) of Ba₂CoZnFe<SUB>12</SUB>O<SUB>22</SUB> samples in various sintered at 1050, 1100, 1150 ,and 1200 ℃ were showed around Ms= 33.0 emu/g. However, With increasing sintering temperature, the coercivity (H<SUB>c</SUB>) of samples decrease. Complex permeability and permittivity of samples in various sintering temperatures were measured between 100MHz to 4 GHz. With increasing sintering temperature, the permeability of samples increase.
Ce 치환된 ThMn<SUB>12</SUB> 구조의 Fe-rich 화합물의 제조 및 자기적 특성 연구
임정태(Jung Tae Lim),천휘동(Hui-Dong Qian),박지훈(Jihoon Park),김종우(Jong-Woo Kim),최철진(Chul-Jin Choi) 한국자기학회 2019 韓國磁氣學會誌 Vol.29 No.2
Recently, Fe-rich ThMn<SUB>12</SUB> compounds have shown potential as next generation permanent magnet materials. Ce element is low cost than Sm element. Therefore, The crystallographic and magnetic properties of (Sm₁ − <SUB>x</SUB>Ce<SUB>x</SUB>)(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)11Ti (x = 0.0, 0.1, 0.3, and 0.5) have been investigated by using X-ray diffractometer (XRD), and vibrating sample magnetometer (VSM). The phase identity and volume fraction of all samples were determined by using Rietveld refinement. The magnetocrystalline anisotropy constant and magnetic anisotropy energy were calculated by using the law of approach to saturation and the change of magnetic anisotropy energy by the lattice field ratio was analyzed. Also, the Curie temperature (T<SUB>C</SUB>) was obtained from the temperature-dependent magnetization curves.
비자성상 첨가에 의한 ThMn<SUB>12</SUB> 구조의 철계 자성합금의 자기적 특성 향상
천휘동(Hui-Dong Qian),임정태(Jung Tae Lim),박지훈(Jihoon Park),최철진(Chul-Jin Choi) 한국자기학회 2020 韓國磁氣學會誌 Vol.30 No.3
Recently, Fe-rich alloys with ThMn12 structure have attracted much attention as next generation permanent magnet materials. Among them, Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti alloy shows good magnetic properties, however the low coercivity problem is still to be solved. In order to improve the coercivity, Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti bulk samples were prepared by adding non-magnetic Sm<SUB>7</SUB>Cu₃ powders (0, 5, and 10 wt%). The crystallographic and magnetic properties of Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti added Sm7Cu₃ have been investigated by using X-ray diffractometer (XRD), scaning electron microscope (SEM), and vibrating sample magnetometer (VSM). The phase identity and volume fraction of Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti powders were determined by using Rietveld refinement. The phase distribution of grains and grain boundaries was analyzed by using SEM. With increasing Sm<SUB>7</SUB>Cu₃ content, the value of saturation magnetization of Sm(Fe<SUB>0.8</SUB>Co<SUB>0.2</SUB>)<SUB>11</SUB>Ti bulk samples decreased, while their coercivity increased by about 67% with an addition of a non-magnetic phase.