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Single crystal growth of nanoporous C12A7:e- by controlling melt state.
Yoon, S G,Kim, S W,Yoon, D H,Hirano, M,Hosono, H American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.12
<P>It has been known that electron doped 12CaO x 7Al2O3 (C12A7:e-, electride) single crystals, which are composed of a closed-packed periodic quantum dot structure, may be prepared by strong reduction of the precursor C12A7:O2-, but direct single crystal growth of the C12A7:e- from the melt state has never been achieved to date. We report the melt state of polycrystalline electride in pure dry Ar atmosphere at temperatures of 1290 approximately 1500 degrees C, which leads to the direct single crystal growth of the C12A7:e- from the melt. The electride single crystals with a diameter of 7 mm and a length of 43 mm have been grown by a floating zone method, where a polycrystalline electride feed and an electride single crystal seed rod were employed. The electron concentration in the crystal increased up to approximately 1.0 x 10(20) cm(-3) as the growth proceeded. The present findings suggest that electron-entrapped local structure may exist in the melt and the electrons may act as a template for the formation of C12A7 electride in the solidification process of the C12A7 lattice.</P>
Effeets of Local Damage on Asymptotic Stress Field of a Growing Creep Crack
Murakami, S .,Liu, Y .,Hirano, T .,Mizuno, M . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
A parametric study on the effects of local damage field on the crack-tip stress field of a growing Mode I creep crack is performed in the framework of Continuum Damage Mechanics (CDM). According to the results of creep crack growth analysis based on CDM and Finite Element Method, the damage distribution 1-(D/D_(cr))=h(θ)r^m represented by a power law function of the radius r from the crack tip is postulated for the damage variable D. The damage effects are incorporated into the Norton creep law by means of the hypothesis of strain equivalence of CDM. The resulting two-point boundary value problems of differential equations for the growing creep cracks in the states of plane strain and plane stress are solved by means of a shooting method. For a given creep exponent n of the Norton law, the exponent p of the asymptotic stress field σ_(ij) ∝ r^n is found to be governed by the exponent m of the power law damage distribution r^m.
Y. Liu,S. Hashimoto,K. Yasumoto,K. Takei,M. Mori,Y. Funahashi,Y. Fijishiro,A. Hirano,Y. Takeda 한국물리학회 2009 Current Applied Physics Vol.9 No.11
The catalytic activity of the La0.6Sr0.4CoxFe1-xO3-δ (x = 0.2) perovskite cathode was significantly improved by introducing Ag. This strongly depends on the particle size of Ag that relates to the synthesis route. The Ag particles in nano-range were in situ incorporated into the La0.6Sr0.4Co0.2Fe0.8O3-δ based cathode using a novel infiltration. The functional cathode was successfully operated on the anode-supported cell with a ceria thin-electrolyte resulting in a higher cell output at 500 ℃. Durability of the cell was evaluated within a short-term period. The catalytic activity of the La0.6Sr0.4CoxFe1-xO3-δ (x = 0.2) perovskite cathode was significantly improved by introducing Ag. This strongly depends on the particle size of Ag that relates to the synthesis route. The Ag particles in nano-range were in situ incorporated into the La0.6Sr0.4Co0.2Fe0.8O3-δ based cathode using a novel infiltration. The functional cathode was successfully operated on the anode-supported cell with a ceria thin-electrolyte resulting in a higher cell output at 500 ℃. Durability of the cell was evaluated within a short-term period.