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Shur, J. W.,Lee, H. J.,Yoon, D. H. WILEY-VCH Verlag 2010 Crystal research and technology Vol.45 No.2
<P>Crack-free, rod-shaped single crystals of undoped and 0.5, 0.7 and 1.0 mol% ZrO<SUB>2</SUB>-doped LiNbO<SUB>3</SUB> with a near-stoichiometric composition were grown by the micro-pulling down (μ-PD) method. The structural properties of the grown crystals were examined by powder X-ray diffraction (XRD). Electron probe micro analysis (EPMA) of the near-stoichiometric LiNbO<SUB>3</SUB> single crystals revealed the homogeneous incorporation of Zr ions. The change in the refractive index and IR transmission spectra of the grown crystals were examined as a function of the Zr concentration. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Novel Semiconductor Devices for High Speed VLSI and Ultra-High Frequency Applications
Shur,Michael S.,Lee,Kwy Ro,Peatman,William C. B.,Gelmont,Boris 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
We discuss novel device structures which may present an alternative to conventional technology choices for ultra-high speed integrated circuits. These devices include n-HFETs, Dipole HFETs, complementary HFETr (C-HFETs), split-gate and Variable Threshold voltage HFETs (VTHFETs), Tunneling Emitter Bipolar Transistors (TEBTs), and heterodimensional transistors. π-HFETs are most suitable far digital VLSI applications, C-HFETs hold promise of low power VLSI. Splitgate FETs and Tunneling Emitter Bipolar Transistors devices may find applications in millimeter and submillimeter range. Heterodimensional Transistors have a potential of ultra-low power applications.
단열 ZrO2 Coating 의 내구성에 미치는 NiCrAl 조성의 영향
서동수 ( D . S . Shur ) 대한금속재료학회 ( 구 대한금속학회 ) 1987 대한금속·재료학회지 Vol.25 No.2
The present study examined influence of oxygen-active elements in the bond coating of thermal barrier coating on a nickel-base superalloy. Utilizing plasma spray techniques, bond coating of Ni-Cr-Al alloys containing various additions of Zr, Y, Hf and Si were coated on a substrate and, then, ceramic layer of ZrO2(Y2O3-stabilized) was coated. After static exposure at 1200℃, Al-depleted zones were formed at the ceramic coating side due to selective oxidation of Al and at the substrate side due to interdiffusion of Al. Cracks appeared to initiate at the Al2O3-bond coating interface, and to propagate into the ceramic coating. Resistance against cracking increased in the order of Y-, Zr- and Hf-addition in the bond layer, while additional Si always improved the cracking resistance.
徐昌濟,林炳鎰 成均館大學校 1982 論文集 Vol.31 No.-
Stress corrosion cracking(S.C.C), which was tested in one mole Nacl and 0.9% H_2O_2 solution by loading 90% of 0.2% proof stress on 5,6,7,8 and 10% Mg alloys was investigated and the results are as follow. 1) with increasing of Mg content in Al-Mg alloy, hardness, ultimate tensile strength, proof stress and S.C.C. Susceptibility increased, while elongation decreased. 2) stress corrosion susceptibility was reached to maximum value during the aging and by short time aging with being proportional to increasing of Mg content 3) stress corrosion susceptibility took place earlier than maximum hardness value and the difference was attributed to by variational precipitation behavior. 4) It was though that Al 8% Mg alloy was good for stress corrosion cracking
徐昌濟 成均館大學校 1983 論文集 Vol.33 No.-
In the dendrite structures of unidirectionally and freely solidified Al-Cu and Al-Mg alloys, the effect of cooling rate on microsegregation and the solution kinetics of nonequilibrium second phase were studied by means of X-ray diffraction and method of point count. The main conclusions obtained are as follows; 1) It was found that lattice parameter (a) of alloys change with only the cooling rate without the solidification modes and the kind of alloys. 2) As the cooling rate increases, the solute content in the Al matrix increases while the amounts of nonequilibrium second phase decreases. 3) Nonequilibrium second phase is limited the primary dendrite arm spacing in the later stages of solution treatment. 4) The dissolution time of nonequilibrium second phase is propertionated the square of primary dendrite arm spacing.
徐昌濟 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.2
The effect of activated hydrogen has to bo studied in hydrogen embrittlement by an atmosphere or chemical reaction. According to this study, when hydrogen charged compulsively by cathodically electrolytic process, its change of content, the state of existence and the behavior of embrittlement were investigated in A1-8% Mg alloy. The results are as follows: 1. Hydrogen content increases with charging time and increases adraptly up to 10 minutes and saturates at about 30 minutes 2. Permeated site of hydrogen are octahedral site, but in tetrahedral site, it is permeated with slight strain. 3. Tensile strength and elongation are decreased with hydrogen charging time by diffusion of hydrogen, but elastic property is unchanged. 4. Permeation of hydrogen results in intergranular brittle fracture mode, the degree of embrittlement is proportional to the content of permeated hydrogen. In A1-8% Mg alloy, it is considered that permeated hydrogen affected to result in intergranular brittle fracture by Prefferred permeation into grain boundaries and precipitates.
徐昌濟,金鍾賢,金亨泰,李彰培 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.1
This paper is study on the weldability of Al 8090 alloy which is Li-containing aluminium alloy. This alloy has increased elastic modulus and reduced density compared with conventional aluminium alloys. The weldability of Al 8090 alloy was studied using GTAW(gas Tungsten Arc Welding) with A 40443 and A 5356 filler metal. The quality of the weld was evaluated through mechanical test and microscopical observation, and crack susceptibility was evaluated through varestraint test. In the varestraint test, a bending strain was imposed during welding on the specimen. The total crack length(TCL) and maximum crack length(MCL) were taken as measured of the crack susceptility. After the weldability of Al 8090 alloy was analyzed compared with Al 2024 alloy and Al 7075 alloy, the results were obtained as follows. 1. The hardness distribution of Al 8090 alloy showed up a equal level in comparison with hardness distribution of Al 2024 alloy, Al 7075 alloy. 2. Crack susceptibility with Al 8090 alloy was lower than that with Al 2024 alloy and Al 7075 alloy. 3. The Li added in Al 8090 alloy assists in improving the resistance to crack propagation. 4. The mechanism of fine-grain region formation probably lies in the heterogeneous nucleation aided by Zr. 5. MCL was liner to TCL in Al 8090 alloy, Al 2024 alloy, Al 7075 alloy.