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2006, Vol.16, No.2

  • 1.

    Periodically domain inversion and optical properties of low-loss Ti : LiNbO3 waveguides

    Woo Seok Yang | Yoon Dae Ho | Lee Han Young and 3other persons | 2006, 16(2) | pp.49~52 | number of Cited : 0
    Abstract PDF
    Periodic electric field assisted poling low loss (~0.1 dB/cm) single-mode Ti-diffused waveguides in LiNbO3 has been achieved using a periodically patterned electrode on the +Z surface of Ti : LiNbO3 crystal and homogeneous LiCl solution. Using selective chemical etching, we confirmed the periodic (~16 μm) domain inverted structure and measured SH (second harmonic) properties of fabricated periodically poled Ti : LiNbO3 waveguides.
  • 2.

    Domain formation and expansion during periodic poling of congruent LiNbO3 using external field

    권순우 | Lee Han Young | Yo-Seung Song and 4other persons | 2006, 16(2) | pp.53~58 | number of Cited : 0
    Abstract PDF
    When external field was applied to congruent LiNbO3, it was investgated for domain formation and expansion of LiNbO3. The domain wall velocities of 0.5 mm thickness LiNbO3 were 28.70, 16.02 and 5.75 μm/sec under poling field of 23.5, 22.0 and 21.0 kV/mm, respectively. As 1 MΩ resistor was used in domain inversion system, harmonic domain inversion was not achieved by rapid domain expansion. And 50 % duty cycle periodically poled LiNbO3 have been fabricated by charge control using 10 MΩ resistor.@
  • 3.

    Electrical and optical properties of Al and F doped ZnO transparent conducting film by sol-gel method

    이승엽 | Park,Byung-Ok | 이민재 | 2006, 16(2) | pp.59~65 | number of Cited : 0
    Abstract PDF
    Al-doped and F-doped ZnO (ZnO : Al & ZnO : F) thin films were coated onto glass substrate by sol-gel method.These films showed c-axis orientation in comon, but diferent I(002)/[I(002) + I(101)] and FWHM (full width at half-maximum). In particular, the grain size of the ZnO : Al films decreased with the increase in the Al-doping concentration,effect measurement was used. The resistivity of the ZnO : Al films and the ZnO : F films were, respectively, 2.9 × 102Ωcm at Al 1 at% and 3.3 × 101 Ωcm at F 3 at%. Moreover, compared with ZnO : Al films, ZnO : F films have lowercarier concentration (ZnO : Al 4.8 × 1018 cm3, ZnO : F 3.9 × 1016 cm3) and higher mobility (ZnO : Al 45 cm2/Vs, ZnO : F495 cm2/Vs). For average optical transmittances, ZnO : Al thin films have 86~90 % and ZnO : F films have 77~85 %comparatively low.Key words Sol-gel.. .. Al. F. ... ZnO ...... .. . ... ....... ..... ...†..... ....... , .. , 702-701(2005. 12. 26. .. )(2006. 1. 13. .... ). . Al. ... ZnO(ZnO : Al) ... F. ... ZnO(ZnO : F) ... sol-gel .. .... glass .... ..... . ..... (002).. c-. .... .... . FWHM(full width at half-maximum) ..
  • 4.

    Utilization of the surface damage as gettering sink in the silicon wafers useful for the solar cell fabrication

    KIM YOUNG KWAN | 김대일 | 2006, 16(2) | pp.66~70 | number of Cited : 0
    Abstract PDF
    Various kind of structural defects are observed to be present on the oxidized surface of the silicon crystal whichwas previously damaged mechanicaly. The formation of such defects was found to depend on the amount of damageinduced and the temperature of thermal oxidation. It was confirmed by the measurement of minority carrier life time thatof damage or lower oxidation temperature believed to has higher capability of getering over defects like dislocation lopsor stacking faults.Key words Defects, Strained layer, Silicon crystal, Gettering
  • 5.

    Microstructural observation of artificial aggregates at various sintering atmospheres

    박지윤 | KIM, YOOTAEK | 2006, 16(2) | pp.71~75 | number of Cited : 6
    Abstract PDF
    The aggregates made of clay, carbon and Fe2O3 were prepared to investigate the mechanism of black coreformation and the property diferences at various sintering atmospheres. The aggregates were sintered at oxidized,various compositions and sintering atmospheres. The aggregates sintered at oxidized atmosphere showed clear borderbetween shel and black core area. Hence, the agregates sintered at reduced and neutralized atmospheres showed onlyblack core area in the cross-section of the aggregates. The specific gravity of the aggregates sintered at reduced atmosphereincreased with increasing carbon contents and that was the lowest of al aggregates sintered at various atmospheres.Adsorption rate increased with increasing carbon contents at all atmospheres.Key words Aggregates, Sintering atmosphere, Black core, Carbon, Fe2O3
  • 6.

    Characterization of colloid/interface properties between clay and EAF dust

    Ji-Young Lee | KIM, YOOTAEK | Lee,Ki-Gang and 2other persons | 2006, 16(2) | pp.76~81 | number of Cited : 2
    Abstract PDF
    The leaching behavior of heavy metal ions with pH and colloid/interface property was analyzed by ICP andSEM. The heavy metals in EAF dust are ‘amphoteric metal’ and the heavy metal ions leached a litle at pH 10. And theleaching concentrations of heavy metals at pH 12 were higher than the that at pH 8. The leaching concentrations of heavywere effectively decreased at pH 12. The observation of colloid/interface properties shows that the soluble silicon hydroxidefrom clay at pH 12 was precipitated at the surface of the heavy metal and clay particles. This silicon hydroxideprecipitates were named the PSHP. The leaching concentrations of heavy metal ion were effectively decreased by theformation of PSHP when adding the clay to the EAF dust and controlling the pH of the slurry at 12.Key words Colloid/interface property, Heavy metal, Sedimentation height, PSHP
  • 7.

    Microstructure of borosilicate glass-ceramics containing EAF dust

    안영수 | Lee,Ki-Gang | KANG SEUNG GU and 2other persons | 2006, 16(2) | pp.82~87 | number of Cited : 0
    Abstract PDF
    Glasy specimen was obtained by melting and quenching a borosilicate glas frit mixed with 10~80 wt% EAFdust. The glass transition temperature, Tg of glasy specimen was measured around 550oC from the DTA curve and theheat treatment condition to crystalize a glassy specimen was selected as 70oC/1 hr. The spinel crystal peaks were found incontaining dust > 40 wt%, and the spinel and willemite peaks in dust > 80 wt%. The crystals of several tens of nanometerwith aspect ratio of 0.7~1.0 were observed at a glassy specimen containing dust > 40 wt% by SEM which was not foundby XRD analysis. For the glass-ceramics, the crystals were found in a specimen containing dust of even 10 wt% by SEM.The feature and distribution of crystals observed through the specimen for a glass-ceramics were diverse and not uniform.The crystals found in the glass-ceramics containing 70 wt% dust were hexahedral with an aspect ratio of around unity.Key words Microstructure, Borosilicate, Glas-ceramics, EAF dust, Glas transition temperature, Crystallization, Spinel,Willemite, EDS, XRDEAF dust. ... ..... ... ... .... ..
  • 8.

    Leaching and stabilization of the heavy metals with pH in EAF dust-clay system

    김정환 | Lee,Ki-Gang | KIM, YOOTAEK and 2other persons | 2006, 16(2) | pp.88~93 | number of Cited : 1
    Abstract PDF
    To recycle the electric arc furnace (EAF) dust as a ceramic raw materials, the leaching concentrations of heavymetals (Zn, Pb, Cr, Cd) were analysed with various pH and mixing ratios for EAF dust and EAF dust-clay mixtures. Thebodies of EAF dust-clay mixtures with various mixing ratio and sintering temperature. Toxicity characteristic leachingprocedure (TCLP) test was conducted for evaluating the chemical stabilities of the heavy metal elements. Leachingconcentrations of heavy metal ions shows minimum leaching concentration at the pH 10. Evaporation amount of heavy metalsin the sintered bodies were evaluated for the mixtures of pH 10 depenidng on mixing ratio and sintering temperature.Evaporation of heavy metal components were increased with increasing the sintering temperature and contents of the EAFdust. The evaporation of the heavy metal components in EAF dust was efectively suppressed by increasing the claytemperature.Key words EAF dust, Recycling, Heavy metal, Leaching, EvaporationEAF ... -.... ... .. . .... ... pH. ..