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RISS 인기검색어
- 검색키워드
- 저자 : 한은주(E. J. Han) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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다결정(Fe, In, Eu)₂O₃ 계의 자기적 성질에 관한 연구
김정기(J. G. Kim),서정철(J. C. Sur),한은주(E. J. Han),홍양기(Y. K. Hong) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.1
The magnetic properties of the polycrystalline (Fe₂O₃)_(1-x-y)(In₂O₃)_x(Eu₂O₃)_y (x=0.01, y=0.02 and x=0.02, y=0.03) have been studied by the methods of X-ray diffraction, Mossbauer effect, and magnetic hysteresis measurement. The X-ray diffraction patterns show that the samples have a same crystal structure as α-Fe₂O₃. From the analysis of the temperature dependence of the quadrupole splitting and average half-width, it is found that the Morin transition occurs in the sample of x=0.01 and y=0.02 and the spin angle defined as the angle between the [111] crystal axis and antiferromagnetic vector, changes from about 35° to the (111) plane as increasing the temperature in the sample of x=0.02 and y=0.03. The temperature dependence of magnetic hyperfine field is analyzed by using the spin-wave theory. The isomer shift values at room temperature are found to be given by about 0.35㎜/s for the samples which means that the Fe ions belong to 3+ion. The temperature dependence of isomer shift was analyzed by using the Debye model.
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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.
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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.
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α- Fe₂O₃에 Eu이온을 첨가한 시료의 자기적 성질
김정기,한은주,서정철 漢陽大學校 基礎科學硏究所 1991 基礎科學論文集 Vol.10 No.-
다결정 ???????????????????계의 자기적 성질을 상온에서의 X 선희절, Mossbauer효과 및 자기이력 방법에 의해서 연구하였다. X선희절분석 결과는 이계의 시료들은 α-Fe₂O₃와 동일한 trigonal 결정구조를 가지며 단일 결정상을 나타낸다. Eu 농도의 증강에 따른 사중극자 분열의 변화는 시료들의 Morin 전이온도는 α-Fe₂O₃의 전이온도보다 높은 값을 가짐을 보인다. 또한 시료내의 ??? 이온은 trigonal(111) 평면상에 놓이지 않는다. 자기이력곡선 분석결과는 시료가 갖는 포화자화의 값은 Eu이온 농도의 증가에 따라 증가함을 보인다. The magnetic properties of the polycrystalline ??????????????? system have been studied by the methods of X-ray diffraction, Mossbauer effect, and magnetic hysteresis at room temperature. From the X-ray diffraction patterns, it is found that the samples have the same trigonal structure as α-Fe₂O₃being in the single crystal-phase. The changes of the quadrupole splitting as increasing the concentration of Eu ions indicate that the samples have higher Morin temperature than that of α-Fe₂O₃and the spins of ??? are not on a trigonal (111) planes. The saturation magnetization of the samples increases as increasing the concentration of Eu ions.
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