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In 이온을 첨가한 EuFeO₃의 결정구조 및 자기적 성질
김정기(J. G. Kim),서정철(J. C. Sur),한은주(E. J. Han) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.4
The crystallograpic and magnetic properties of Eu(Fe_(1-x)In_x)O₃ (x = 0, 0.03과 0.05) have been studied by the methods of X-ray diffraction, Mossbauer spectroscopy, and magnetic hysteresis measurement at room temperature. The X-ray results show that the samples have a crystal structure of orthorhombic and unit cell volume of the crystal with the exception of the sample of x = 0 increases as increasing the In concentration. In the analysis assuming two sets of six-line of Mossbauer spectra, it is found that the magnetic hyperfine field in each of sets decreases increasing x. The linewidth of the absorption lines for the samples increased as increasing x. This implies that the data involve a sum of several hyperfine patterns which have intensity being proportional to nPz(X), the probability of an environment with z such Fe neighbors. The magnetic hysteresis curves show decrease of Ms and increase of Hc of the samples with increasing x.
김정기(J. G. Kim),서정철(J. C. Sur),한은주(E. J. Han) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.2
The crystallographic properties of the polycrystalline materials Fe_(1+x)Eu_(l-x)O₃(x = -0.06, 0.0, 0.1, 0.2, 0.3, 0.4) have been studied by the methods of X-ray diffraction and Mossbauer spectroscopy. The results showed that the samples with the composition range of 0.2 ≤ x ≤ 0.3 had the garnet crystal phase, while those with -0.06 ≤ x ≤ 0.0 had the orthoferrite phase. However, with the tendency for the orthoferrite phase to convert into the trigonal phase via garnet phase as increasing the composition x, the orthoferrite-garnet and garnet-trigonal phase coexisted dominantly in the range of 0.0 < x < 0.2 and 0.4 ≤ x, respectively. The analyzed results of Mossbauer spectrum indicated existence of some vacancies in the d-site of garnet phase, which can be related to the change of intensity in X-ray diffraction patterns.
플라즈마 이온주입 방법에 의한 질화철 제조 및 자기적 성질
김정기(J. G. Kim),김곤호(G-H Kim),김용현(Y. H. Kim),한승희(S. H. Han),김철성(C. S. Kim) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.1
Fe-N(iron-nitrogen) crystal phases were prepared by nitrogen ion implantation into α-Fe foil with Plasma Source Ion Implantation (PSII). Ion implantation time of sample is treated 15 minutes (FeN15) and 30 minutes (FeN30). The nitrogen depth profiles measured by Auger electron spectroscopy (AES) were determined to be about 12000 Å and 40000 Å for the samples of FeN15 and FeN30, respectively. The results of vibrating sample magnetometer (VSM) show that the saturation magnetization of the samples of as-implanted FeN15 and FeN30 was higher than that of pure α-Fe foil, which may be owing to α' -Fe_(16)N₂ or α-Fe_(16)N₂ phases. Accordingly this study shows the possibility of the partial formation of a' or a phase in iron nitrogen produced by PSII method.
김정기(J. G. Kim),한경훈(K. H. Han),서정철(J. C. Sur) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.4
The crystallographic and magnetic properties of the system of Fe_(1-x)Co_x (x=0.2 and 0.4) prepared by microwave arc-melting with the maximum power of 3.5 ㎾ and a iron-foil with thickness of 25 ㎛ have been studied by the methods of X-ray diffraction and the measurement of the magnetic hysteresis using the vibrating sample magnetometer at room temperature. The samples were prepared in three different ways: First, pellet form pressed under the pressure of 9,000 N/㎠. Second, thin sheet cold rolled. Third, thin sheet treated with the temperature of 900℃. The X-ray diffraction pattern of the sample prepared by the first method shows that the crystal structure of the sample is bcc as same as that of Fe with a good uniformity. The iron-foil has the coercivity of 43 Oe and the initial slope of magnetization of 0.328 emu/gOe. The coercivity and magnetization of the sample prepared by the second method increased as the Co content increased. But the initial slop of the magnetization decreased as the Co content increased. This means that the displacement of domain wall is suppressed by the increase of coercivity as the Co content increased. The saturation magnetization of the samples made by the third method increased. On the other hand, the coercivity of these samples decreased. The increase of saturation magnetization of the samples seems to be related to the changes in X-ray intensity after heat treatment. Also some magnetic parameters of the samples were calculated by using a simple model and compared with other values.