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홍치유(Chi Yhou Hong),강태원(Tae Won Kang),정천기(Cheon Kee Chung) 한국진공학회(ASCT) 1992 Applied Science and Convergence Technology Vol.1 No.1
반응성 RF 스파타 증착법으로 스테인레스 스틸 기판 위에 TiC 박막과 TiN 박막을 증착하였다. 스파타기체로 Ar를, 반응기체로 C₂H₂와 N₂ 기체를 사용하였다. 박막의 증착율은 RF 출력증가에 따라 선형적으로 증가하였으며 스파타기체에 대한 반응 기체의 분압비 증가에 따라 급격하게 감소하였다. 박막의 성분은 TiC 박막의 경우 분압비 0.03에서, TiN 박막의 경우 분압비 0.05에서 stoichiometric한 성분이 된다. 이 TiC, TiN 박막의 morphology와 미세구조 및 계면을 AES, SEM, 그리고 TEM으로 조사하였다. 또한 N^+ 이온을 주입하여 N^+ 이온 주입효과와 열처리 효과도 조사하였다. TiC and TiN layers were deposited on the stainless steel substrate by the reactive RF sputtering. Ar was used for sputtering gas and C₂H₂ and N₂ were used for reaction gas. Deposition rate increased linearly to the applied RF power, and decreased as the partial pressure ratio of sputter gas to reactive gas increased. The thin layers were stoichiometric at the partial pressure ratio of 0.03 for TiC and at partial pressure ratio of 0.05 for TiN. The morphologies and structures of the thin layers were investigated by AES, SEM and TEM. In addition, N^+ ion was implanted to TiC and the resulting influence on the film and annealing effects were also examined.
Hydrogenation on Defect Levels of GaAs Epilayer on Si
배인호,강태원,홍치유,임재영,조성환,장진,이완호,Bae, In-Ho,Kang, Tae-Won,Hong, Chi-Yhou,Leem, Jae-Young,Cho, Sung-Hwan,Jang, Jin,Lee, Wan-Ho The Institute of Electronics and Information Engin 1990 전자공학회논문지 Vol.27 No.1
GaAs epilayer was grown on Si(100) substrate using the two-step growth method by MBE. The crystal growth mode have been investigated by RHEED. The hydrogenation effects of GaAs epilayer were studied by DLTS and Raman spectroscopy. The four electron traps in GaAs/Si layer were observed and their activation energy ranged from 0.47 eV to 0.81 eV below the conduction band. After hydrogenation at 250\ulcorner for 3 hours, new trap not observed and electron traps at Ec-0.68, 0.54 and 0.47 eV were almost passivated. Whereas the Ec-0.81 eV level showed no significant change in concentration. From Raman measurement, GaAs epilayer is found to be influenced by the tensile stress.
AuGe 액체금속 이온이 주입된 n-GaAs의 물성연구
강태원,이정주,김송강,홍치유,임재영,정관수,Kang, Tae-Won,Lee, Jeung-Ju,Kim, Song-Gang,Hong, Chi-Yhou,Leem, Jae-Young,Chung, Kwan-Soo 대한전자공학회 1989 전자공학회논문지 Vol. No.
액체금속이온원으로 부터 발생한 AuGe 이온빔을 GaAs기판에 주입시킨 후 이 시료의 표면성분과 구조를 AES(Auger electron spectroscopy), RHEED(reflection high energy electron diffraction), SEM(scanning electron microscopy) and EPMA(electron probe microanalysis)등으로 조사하였으며 AES depth profile 실험결과를 이체충돌에 의한 Monte Carlo simulation과 비교하였다. AuGe 이온이 주입된 시료를 AES, EPMA로 측정한 결과 As의 preferential스피터링이 나타났으며 300$^{circ}$C로 열처리하면 Ga과 outdiffusion되었다. 또한 측정한 Au와 Ge의 depth profile은 이체충돌에 의한 Monte Carlo simulation의 결과와 잘 일치하였다. The ion beam extracted from the AuGe liquid metal ion source was implanted into GaAs substrate. The surface composition and the structure of ion implanted samples were investigated by AES, RHEED, SEM and EPMA. The depth profiles measured by AES were compared with the results of Monte Carlo simulation based on the two-body collision. As the results of AuGe ion implantation the preferential sputtering of As were revealed by AES and EPMA, and the outdiffusion of Ga and Ge was investigated by 300$^{circ}C$ annealing. The Au and Ge depth profiles measured by AES agreed with the results of Monte Carlo simulation based on the two-body collision.
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.
硫酸鐵內의 鐵 Ion에 對한 Mo¨ssbauer 效果測定
洪致裕,文龍植,姜信珪 東國大學校 1975 論文集 Vol.14 No.-
Mo¨ssbauer spectra of Fe^2+ ion in FeSo_4·7H_O were taken at room and liquid air temperature of 300°K and 80°K respectively. The isomer shifts at these temperature were measured to be 1.07mm/sec, 1.18mm/sec. The quadrupole splittings of this sample were also observed as 3.25mm/sec and 3.44mm/sec at room and liquid air temperature. these data indicate that the isomer shifts and quadrupole splittings of Fe ion in this sample increase with the decrease of temperature. The temperature dependece of quadrupole splitting could be caused by thermal excitation of the Fe ion. and these Mo¨ssbauer patterns do not show that the magnetic hype rfine splitting.
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.
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.
Electromechanical Drive System의 依한 Mo¨ssbauer Spectrum
洪致裕 東國大學校 1976 論文集 Vol.15 No.-
We got Mo¨ssbauer spectra of natural iron and stainless steel by means of a constant acceleration Mo¨ssbauer spectrometer using Electromechanical Drive System. We used stainless steel and natural iron foil as Absorbers. 14.4 kev gamma ray from a Co^57 source modulated by Doppler effect, was detected by a scintillation counter. We obtained a six-line magnetic hyperfine spectrum of natural iron, which was analyzed to express 3.324×10^5 gauss as the magnetic hyperfine field at room temperature. Zero channel was analyzed to express 49.5 channel as the velocity per channel. A single line spectrum of stainless steel absorber was also obtained to express the isomer shift of 0.43/sec