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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Crystal Growth and Crystal Technology
Journal Basic Information
Journal DOI :
The Korea Association of Crystal Growth
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Dec 2004
Volume 14, Issue 5 - Oct 2004
Volume 14, Issue 4 - Aug 2004
Volume 14, Issue 3 - Jun 2004
Volume 14, Issue 2 - Apr 2004
Volume 14, Issue 1 - Feb 2004
Selecting the target year
Adsorption properties and metal growth aspects on the surface of activated carbon monolith electrochemically deposited with Ag
Oh, Won-Chun ; Lim, Chang-Sung ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 37~46
The electrochemical adsorption of the Ag ions from aqueous solution on pelletized activated carbon monolith was investigated over wide range of operation time. The adsorption capacities of pelletized activated carbon monolith are associated with their internal porosity and are related properties such as surface area, pore size distribution. The chemical industry generates wastewater that contains toxic matters like heavy metals in small concentrations so that their economic recovery is not feasible. But, the method using activated carbon monolith can be used to withdrawal of heavy metals in waste water. After the electrochemical treatment, the quantitative properties in Ag ion solutions are also examined by pH concentration and studied elemental analysis by ICP-Atomic Emission Spectrometer and Energy Disperse X-ray (EDX) spectra. It is consider that the pH is very important factor at the reason of water pollutant with increasing acidity in industrial field. The result of quantitative analysis using Inductively Coupled Plasma-Atomic Emission Spectrometer of metal after electrochemical reaction in Ag ions solution depending on time are shown that the amount of Ag ions deposited was decreased with growth of Ag particles on the carbon surfaces as increasing electrochemically treated time. And, surface morphologies are investigated by scanning electron microscopy (SEM) to explain the changes in adsorption properties.
Impact of gate protection silicon nitride film on the sub-quarter micron transistor performances in dynamic random access memory devices
Choy, J.-H. ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 47~49
as an alternative to a conventional re-oxidation process in Dynamic Random Access Memory devices is investigated. This process can not only protect the gate electrode tungsten against oxidation, but also save the thermal budget due to the re-oxidation. The protection
process is applied to the poly-Si gate, and its device performance is measured and compared with the re-oxidation processed poly-Si gate. The results on the gate dielectric integrity show that etch damage-curing capability of protection
is comparable to the re-oxidation process. In addition, the hot carrier immunity of the
deposited gate is superior to that of re-oxidation processed gate.
Growth and characterization of lead bromide: application to mercurous bromide
Kim, Geug-Tae ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 50~57
Mercurous Bromide (
) crystals hold promise for many acousto-optic and opto-electronic applications. This material is prepared in closed ampoules by the physical vapor transport (PVT) growth method. We investigate the effects of solutal convection on the crystal growth rate in a horizontal configuration for diffusive-convection conditions and purely diffusion conditions achievable in a low gravity environment. Our results show that the growth rate is decreased by a factor of one-fourth with a ten reduction of gravitational acceleration near y = 2.0 cm. For 0.1
the growth rate pattern exhibits relatively flat which is intimately related to diffusion-dominated processes. The growth rate nonuniformity is regardless of aspect ratio across the interfacial positions from 0 to 1.5. Also, the effect of a factor of the ten reduction in the gravitational acceleration is same to both Ar = 5 and 2. The enlargement in the molecular weight of B from 50 to 500 by a factor 4 causes a decrease in the maximum growth rate by the same factor, indicative of the effect of solutal gradients.
Effect of anisotropic diffusion coefficient on the evolution of the interface void in copper metallization for integrated circuit
Choy, J.H. ;
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 58~62
The shape evolution of the interface void of copper metallization for intergrated circuits under electromigration stress is modeled. A 2-dimensional finite-difference numerical method is employed for computing time evolution of the void shape driven by surface diffusion, and the electrostatic problem is solved by boundary element method. When the diffusion coefficient is isotropic, the numerical results agree well with the known case of wedge-shape void evolution. The numerical results for the anisotropic diffusion coefficient show that the initially circular void evolves to become a fatal slitlike shape when the electron wind force is large, while the shape becomes non-fatal and circular as the electron wind force decreases. The results indicate that the open circuit failure caused by slit-like void shape is far less probable to be observed for copper metallization under a normal electromigration stress condition.
Structural change of cobalt dodecanesulfate
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 63~67
The layered structure of cobalt dodecanesulfate was synthesized. A phase transition takes place at various temperature ranges and results in a drastic change of the layer distance. A monolayer structure of cobalt dodecanesulfate at room temperature transformed to a bilayer structure as a dehydrated form at high temperature.
Melt growth and superconducting properties of Sm-doped YBCO super-conductor by zone melting method
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 68~72
Sm-doped YBCO high
superconductor was directionally grown by zone melt growth process in air atmosphere. Cylindrical green rods of
[(Sm/Y)1.8] oxides were fabricated by cold isostatic pressing (CIP) method using rubber mold. Based on the variation of melting temperature and growth rate, the microstructure and superconducting properties were systematically measured by using optical micrographs, TEM and SQUID magnetometer. In this study optimum melting temperature and growth rate were
and 3.5 mm/hr respectively. Nonsuperconducting
inclusions of (Sm/Y)1.8 superconductor were uniformly distributed within the superconducting (Sm/Y)
matrix. The directionally melt-textured (Sm/Y)1.8 superconductor showed an onset
90K and sharp superconducting transition.
The color enhancement of natural Zambian amethyst by the hydrothermal treatment method
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 73~77
The color enhancement for natural Zambian amethyst of low quality was carried out by the hydrothermal treatment method. The hydrothermal treatment conditions were as follows: reaction temperature;
, duration; 30 hrs, filling; 40%, solvent; 6 M-HCI solution. The reddish purple amethyst of high quality was obtained under these conditions. From the result of ICP/AES, it was known that color enhancement was affected by a Fe elemental content to exist in the inside of natural Zambian amethyst. Also, from the result of UY-VIS-NIR, it was shown that the absorption peak at 550 nm after hydrothermal treatment is slightly lower than those of non-treated natural Zambian amethyst. In this study, it was known that hydrothermal treatment method was a way to suitable for increase of commercial value of natural Zambian amethyst.
The cultivation and characterization of imaged abalone pearls
Journal of the Korean Crystal Growth and Crystal Technology, volume 14, issue 2, 2004, Pages 78~81
The nacre of imaged abalone pearls was obtained as a calcium carbonate of aragonite type. This result was same the nacre of natural abalone pearl. From the observation of SEM for the nacre adhered on the pearl nucleus, it was known that the layers of calcium carbonate and conchiolin were stratified. The growth rate of nacre was found to be 0.0056∼0.0074 mm/day, which is twice faster than that of traditional method used shells. The pendant and brooch were manufactured using the imaged abalone pearls.