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김근수,추고연,김태환,성재석,이용택,오숭호,이민수,최호상 한국공업화학회 2003 응용화학 Vol.7 No.1
Zeolite membrane was produced by hydrothermal synthesis on α ̄alumina substrate using clear solution method. Zeolite membrane can separate liquid phase reactants like a water/mehtanol system. The compogition ratio of raw materials. 90 Na_2O : 1 Al_2O_3 : 9 SiO_2 : 5760 H_2O was used for preparation of zeolite membrane. The deposition states of zeolite crystal on alumina substrate by change of aging time were analysed through XRD and SEM.
결정화시간이 다공성 알루미나 지지체에서의 A 형 제올라이트 결정성장에 미치는 영향
김태환,김권일,안계혁,김종휘,성재석 한국공업화학회 1998 응용화학 Vol.2 No.2
A-type zeolite crystals were grown on the surface of porous alumina support by the hydrothermal crystallization technique. In the experiment, the oxide mole ratio of raw material composition was maintained at a constant value and the crystallization time was varied. The crystal morphology, size and its coating status on the support were investigated by means of SEM microphotographs and XRD analysis, studies.
Perovskite계 La_(0.9)Sr_(0.1)(Ga_(1-x)Fe_(x))_(0.8)Mg_(0.2)O_(3- δ) 의 제조 및 특성
추고연,김태환,김권일,Politova, E. D.,성재석 한국공업화학회 2004 응용화학 Vol.8 No.1
In this paper, perovskite-type La_(0.9)Sr_(0.1)(Ga_(1-X)Fe_(X))_(0.8)Mg_(0.2)O_(3-6)(x=0-0.5) powders were prepared by solid state reaction, followed by estimation of phase structures and properties according to Fe contents and sintering conditions. Impurity phases as well as perovskite phase were observed in the powders which were calcined at 800℃ for 10h followed by sintering at 1300℃ for 10h. The smallest amount of the impunrity phases was observed in the powder with the highest Fe content. The X-ray diffraction peaks corresponding to the 220 peak in pseudo cubic lattice were collected. The data were used for calulation of orthorhombic unit cell parameters by PROFITVZ program. Mean unit cell parameters(V^(1/3)) decreased with x at the Fe contents not more than 0.2 and increased with x at the Fe contents not less than 0.3. Electrical conductivity of the bar-like samples was measured as a function of temperature from 290K up to 1200K in air by a standard two-probe technique using platinum electrodes. The relationship between lot(oT) and l/T as lkHz exhibited the Arrhenius behavior, Electrical conductivity increased with Fe contents. Particularly, Fe contents substantially contributed to electrical conductivity at lower temperature. In air, La_(0.9)Sr_(0.1)(Ga_(0.75)Fe_(0.25))_(0.8)Mg_(0.2)O_(3-6) perovskie-type oxide showed the reversible elongation property in which the structural phase transition occurred at near 600℃.