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장건익,김범진,임일성 한국센서학회 1999 센서학회지 Vol.8 No.2
γ-Fe₂O₃ thin films on Al₂O₃ substrate were prepared by the oxidation of Fe₃O₄ thin films processed by PECVD(Plasma-Enhanced Chemical Vapor Deposition) technique. The phase transformation of γ-Fe₂O₃ thin films was mainly controlled by the substrate temperature and oxidation process of Fe₃O₄ phase. Fe₃O₄ phase was obtained at the deposition temperature of 200∼300℃. Fe₃O₄ phase could be transformed into γ-Fe₂O₃ phase under controlled oxidation at 280∼300℃. Fe₃O₄ and γ-Fe₂O₃ obtained by oxidation of Fe₃O₄ phase had the same spinel structure and were coexisted. The oxidized γ-Fe₂O₃ thin film on Al₂O₃ substrate showed a porous island structure.
장건익,안병국,김동건 대한용접접합학회 2002 대한용접·접합학회지 Vol.20 No.2
The fatigue life is predicted on tensile-shear spot weldment made from Al-Mg alloy sheet with thickness of 0.8mm using Mitchell's method and uniform material law by $B{\ddot{a}}umel$ and Seeger based on local strain approach. The fatigue properties of critical HAZ region are estimated from the tensile property using simple hardness method. To predict the fatigue life of spot weldment, the local stresses and strains at the potential critical region are estimated by Neuber's rule. The predicted fatigue life based on uniform material law using HAZ's material properties provides good results within a factor of 3, conservatively.
Dielectric Properties of Bi3.25Nd0.75Ti3O12 Thin Film
장건익,김기범,윤대호 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
Bi4xNdxTi3O12 (BNdT)thin lms with the composition (x = 0.75) have been prepared on Pt/Ti/SiO2/Si(100) substrates by using metal-organic precursor solutions by a chemical deposition method. The lms were annealed at various temperatures from 550 C to 650 C. Above 600 C, well-crystallized BNdT thin lms with bismuth layered perovskite structure were obtained and revealed a random orientation without typical (00l) preferred diraction patterns. The BNdT lm annealed at 650 C exhibited a remanent polarization (2Pr) of 56 C/cm2 and coercive eld (2Ec) of 232 kV/cm, respectively. The capacitor did not show any signicant fatigue up to 8 1010 read/write switching cycles at a frequency of 1 MHz, regardless of annealing temperature.
액체질소 냉각 시 임의의 홀을 가진 초전도체의 열응력 해석
장건익,이호진,김찬중,한영희,성태현,Jang, G.E.,Lee, H.J.,Kim, C.J.,Han, Y.H.,Sung, T.H. 한국초전도학회 2009 Progress in superconductivity Vol.11 No.1
Temperature distributions and thermal stresses were calculated and analyzed to investigate the effect of the artificial holes to the transient behaviors of the superconductors which was cooled in liquid nitrogen. Three dimensional finite element method was used to calculated the transient temperature and thermal stresses in the superconductors. The cooling speed of the superconductors with holes is faster than those without holes. Because the thermal stresses calculated in the superconductors can be relaxed by the distributed holes, the volume of the peak tensile stress decreases during the cooling in liquid nitrogen. If optimal metal, which can maintain the relaxation of thermal stresses, is used to fill and reinforce the artificial holes, the probability of failure of the superconductors may be decreased by the decrease of volume of peak tensile stress.
MOCVD법을 이용한 Bi-2212계 초전도박막 제조 및 특성에 관한 연구
장건익,김호인,박인길,김호기 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.10
Bi-Sr-Ca-Cu-O superconductor thin films were prepared on MgO and LaAlO3 substrates by MOCVD technique. The films deposited on MgO and LaAlO3 substrates became superconducting at 64 K and 70 K respectively. The measured critical current density of thin film deposited on LaAlO3 substrate was around 104 A/$\textrm{cm}^2$. After annealing at $700^{\circ}C$ for 3 hours, the critical transition temperature(Tc) of films deposited on LaAlO3 was changed from 70 K to 74 K.