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Sodium-Disilicate 유리계내의 Fe이온에 대한 연구
홍치유,김순구,이철세,백승도 東國大學校 1990 論文集 Vol.29 No.-
In this paper, the Mo¨ssbauer spectra of(Na_2O.2SiO_2)_(100-x)(FeO)_x and ((Na_20.2SiO_2)??_x(Fe_2O_3)_x glass systems were invesigated at room temperature. The isomer shift quadrupole spitting and line width have a difference in quantity between the two glass system. As the content of Fe ion increase int eh two glass systems, the isomer shift and line width decrease, but the quadrupole splitting increases. the fe ion in the two glass systems are ferric state and play a role of glass modifier.
Mo¨ssbauer분광법에 의한 Ca_(0.75)Ba_(0.25)Fe_2O_4의 Fe이온에 대한 연구
홍치유,윤인섭,조수열,김영민,황진철 東國大學校 1992 東國論叢 Vol.31 No.-
The Mo^ssbauer spectrum of CaFe_2O_4, consists of paramagnetic two doublets absorption peaks at room temperature. But, the replacement of Ca^+2 ions in CaFe_2O_4 with Ba^+2 ions changes the magnetic properties without changing the crystal structure and the Mo^ssbauer spectrum of Ca_0.75Ba_0.25Fe_2O_4 consists of paramagnetic two doublets and ferrimanetic three different Zeeman sextets absorption peaks due to the Fe^57 nuclei in the various sublattices. According to this study, the Fe ions in the Ca_0.75Ba_0.25Fe_2O_4 are trivalent in al sublattices and there are more than three sublattices in this structure.
Mo¨ssbauer 분광법에 의한 MgFe_(2-x)Al_xO_4계의 Fe이온에 대한 연구
홍치유,윤인섭,김영민,황진철,조수열 東國大學校 1993 東國論叢 Vol.32 No.-
In this study, the magnetic properties and hyperfine interaction have been investigated by Mo‥ssbauer spectroscopy. The samples were prepared by ceramic sintering method with Al contents x. Mo‥ssbauer spectra of the MgFe_(2-x)Al_xO_4 system have been taken in room temperature and the superparamagnetic effect appeared for Al substitution content x≥0.8. The isomer shift of Fe ions in octahedral site decreased as increasing Al contents x, but in tetrahedral site it were constant. The magnetic hyperfine fields of samples decreased as increasing Al contents x in both site, octahedral and tetrahedral site. But magnetic transition patterns did not appeared in spite of increasing the nonmagnetic ion, Al^(3+), contents x.
Mo¨ssbauer 분광법에 의한 Mg-Cd 페라이트계의 자기적 성질 연구
홍치유,최달하,문용식,백승도 東國大學校 1988 論文集 Vol.27 No.-
In this study, the magnetic properties of Mg_(1-X)Cd_(X)Fe₂O₄ ferrite system has been studied by Mo‥ssbauer spectroscopy. All the samples, prepared by a ceramic sintering method, were found to be single phase spinel by X-ray diffractometry. The Mo‥ssbauer spectra. for x<=0.3, show two magnetic hyperfine splittings. one due to Fe^3+ octahedral site ions and the other due to tetrahedral site ions. While for x=0.4 spectrum shows relaxation behaviour and for x>=0.5 it exhibits quadrupole splittings. This result implicates that the magnetic properties of Mg_(1-X)Cd_(X)Fe₂O₄ferrite system change from ferrimagnetics to paramagnetics as increasing x, And the x, Cd content, dependence of Mo‥ssbauer parameters (isomer shift, quadrupole splitting, magnetic hyperfine field and line width) were investigated.
10MgO-10Fe_2O_3-30Na_2O-5OSiO_2 유리의 Mo¨ssbauer 효과 연구
홍치유,박관호,백승도,문찬호,조수열 동국대학교 1987 論文集 Vol.26 No.-
The Mo¨ssbauer effect studies of the quenched glass and heat-treated glasses were performed. The Debye and Einstien temperatures of the quenched glass, determined using the center shift and kinetic temperature, are 540K and 430K respectively. The X-ray diffraction pattern showed that the heat-treated glasses were crystallized. Form the isomer shift of the heat-treated glasses, it was concluded that the Fe^(3+) ion is predominantly octahedrally coordinated.
Mo¨ssbauer 분광법에 의한 NiAl_0.6Fe_1.4O_4의 자기적 성질 연구
홍치유,이철세,윤인섭,조수열 東國大學校 1991 東國論叢 Vol.30 No.-
The Mo‥ssbauer spectroscopy method was used in an investigation of the temperature dependence of magnetic properties of NiAl_0.6 Fe_1.4 O_4 in which Fe ion was substituted by Al ion in octaheadral site. The magnetic relaxation patterns of the sample were shown a superparamagnetic relaxation in Mo‥ssbauer spectrum. The isomer shifts decreased as increasing temperatuer and quadrupole splittings revealed somewhat different type in each site and the magnetic hyperfine field decreased as increasing temperature and revealed magnetic transition about 700K.
저온에서의 Iron Powder의 Mo¨ssbauer 효과
洪致裕,白承道,金振璜 동국대학교 1985 論文集 Vol.24 No.-
The Mo¨ssbauer parameters of iron powder were measured from 50K to 303K. As the temperature decreased, the center shift and internal magnetic field increased. And using the kinetic temperature and center shift, we determined the einstein temperature and Debye temperature, to be 316K, 436K respectively. From this result, we think that this method for measuring the Debye temperature is useful.
Mo¨ssbauer Spectroscopy에 衣한 Hamatinics內의 鐵의 酸化狀態 및 Spin狀態의 硏究
洪致裕,黃鎭澈,尹仁燮 동국대학교 산업기술대학원 1993 산업기술논문집 Vol.1 No.-
Mo¨ssbauer spectroscopy has been carried out to investigate the ionic states of Fe atoms contained in the hematinics. From the Mo¨ssbauer parameters we can define the hyperfine interactions of Fe atoms with surrounding elements related to Fe ionic states. The Fe in the sample used as hematinics usually exist in the S=2 high spin state of Fe^(+2) or in the S=1/2 low spin state of Fe^(+3). In this study we knew that Fe^(+2) state was preferable to Fe^(+3) state on the hematinics.