• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2000년도 추계총회,초청강연,특별강연,연구발표회
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• pp.103.1-103
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• 2000

• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2000년도 추계총회,초청강연,특별강연,연구발표회
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• pp.44.2-44
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• 2000

• 한국재료학회:학술대회논문집
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• 한국재료학회 1996년도 재료학회 추계학술발표회
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• pp.63-63
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• 1996

• 한국세라믹학회지
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• 제25권5호
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• pp.479-487
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• 1988

In this study we studied the function of Glycerol as a DCCA(Drying Control Chemical Additives) in the preparation of silica bulk glas through Sol-Gel method. We used TEOS(Tetra Ethyl Ortho Silicate) and maintained the mixing ratio of TEOS : H2O : EtOH : HCI as 1 : 4 : 4 : 0.0007(mol) and varied glycerol input quantity from 0.1vol% considering the ethnaol input quantity as 100vol%. We investigated the changes from Sol-Gel Synthetic solutions to the glass using DT-TG, FT-IR and other instruments. The results obtained from this experiment showed that the dried gels made from the synthetic solutions containing 0.1-1.0vol% of glycerol were easily heat-treated up to 85$0^{\circ}C$ so that transparant bulk silica glass was prepared.

• 공업화학
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• 제7권2호
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• pp.269-279
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• 1996

SOL-GEL법을 이용하여 $SiO_2-TiO_2-V_2O_5$계의 다공성 비정질 촉매를 그 제조변수를 달리하면서 제조 하였다. 이들 촉매들을 사용하여 "모조 배가스 합성 및 미량 촉매 반응기" 상에서 NO 제거 활성 측정을 통한 Screening test를 실시하여 가장 우수한 촉매 활성을 나타내는 최적의 입자상 촉매를 선정하였다. 또, 입자상 촉매의 제조변수에 입각하여 비활성, 기통성이 우수한 cordierite monolith 담체위에 활성성분을 SOL-GEL법으로 반복 coating하여 monolith형 촉매들을 제조하였으며, 이들을 전형적인 S. C. R.(Selective Catalytic Reduction of NOx) 공정에 해당되는 반응 조건하에서 NOx 및 SOx의 동시제거 효과를 측정해 보았다. 아울러 동촉매들의 특성화를 위해 DTA, TGA, BET, $NH_3$ 및 NO TPD, ESCA, XRD 등을 실시하여 보았다.

• The Korean Journal of Ceramics
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• 제7권1호
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• pp.1-5
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• 2001

Inorganic-organic hybrid Li$^+$ ion conductors were prepared by the sol-gel process. Tetramethyl orthosilicate (TMOS), polyethylene glycol 200 (PEG$_200$) and lithium bis (trifluoro-methylsulfony) imide were used as raw materials and $H_2O$ was used as a solvent. Hybrid Li$^+$ ion conductor prepared by the sol-gel process showed very high ion conductivities of log${\sigma}_R.T$(S/cm)=-3.73, log${\sigma}_60$(S/cm)=-3.00 at room temperature and $60^{\circ}C$, respectivery. Decomposition voltage was 3.1 V.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.714-718
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• 2003

Usually for the commercial preparation of barium titanate films or ceramics the reaction atmosphere must be preferably in air. However, normally air is not used because it contains carbon dioxide, which can easily react with barium to form the undesired product barium carbonate, leading to unwanted second-phase formation in the (mal stages of the process. In the present work a series of perovskite barium titanate films was prepared by the sol-gel method, using a metal alkoxide solutions in the electrophoretic deposition (EPD). The influence of several process parameters, like sintering temperature of sol preparation before EPD and heat-treatment temperature and non-oxidized atmosphere, on the film properties is described.

• 한국정보전자통신기술학회논문지
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• 제1권2호
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• pp.27-32
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• 2008

A current research basically diverted towards an increase in the operational output with the minimization of the materials used, which ultimately scaled down the dimensions of ceramic electronic components. In this direction the nano-technology pave the revolutionary changes in particular the electronic industries. The applications of nano-sized particles or nano-sized materials are hence, playing a significant role for various purposes. The PZT(lead, zirconium, titanium) based ceramics which, are reported to be ferroelectric materials have their important applications in the areas of surface acoustic waves (SAW), filters, infrared detectors, actuators, ferroelectric random access memory, speakers, electronic switches etc. Moreover, these PZT materials possess the large electro mechanical coupling factor, large spontaneous polarization, low dielectric loss and low internal stress etc. Hence, keeping in view the unique properties of PZT piezoelectric ceramics we also tried to synthesize indigenously the small sized PZT ceramic powder in the laboratory by using the modified sol-gel approach. In this paper, propyl alcohol based sol-gel method was used for preparation of PZT piezoelectric ceramic. The powder obtained by this sol-gel process was calcined and sintering to reach a pyrochlore-free crystal phase. The characterization of synthesized material was carried out by the XRD analysis and the surface morphology was determined by high resolution scanning electron microscopy.

• 한국세라믹학회지
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• 제31권7호
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• pp.804-812
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• 1994

Stable PZT coating sol was prepared using chelating agent, ethylacetoacetate(EAcAc) by sol-gel processing under ambient atmosphere. Through FT-IR spectrum analysis on solution of each reaction step, formation of metal complex was confirmed and prepared PZT sol was stable over several months. Through TG-DTA, XRD, FT-IR spetrum analysis of PZT gel powder, it was understood that the addition of EAcAc could reduce the transition temperature to ferroelectric phase, due to the increased homogeneity by matching the hydrolysis and condensation rates by chelation. Single perovskite phase was obtained by the heat-treatment at 54$0^{\circ}C$ for 30 min. The film was coated on ITO-coated glass substrate by dip coating method. After heat-treatment, PZT thin film had thickness in the range of 20~130 nm. The maximum dielectric constant of its thin film at room temperature and 1 kHz was 128.

• 한국정보통신학회논문지
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• 제9권7호
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• pp.1491-1496
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• 2005

[ $Pb_{0.72}La_{0.28}TiO_3$ ] (PLT(28)) 박막을 sol-gel 법을 이용하여 제작한 후, 그 특성을 조사하여 ULSI DRAM 의 캐패시터 절연막으로서의 적용 가능성을 연구하였다. Sol-gel 법의 출발 물질로는 acetate 계를 사용하였다. TGA-DTA 분석을 통하여 PLT(28) 박막의 sol-gel 법에 의한 공정 조건을 확립하였다. 매 coating 후 $350^{\circ}C$ 에서 drying 하고, 마지막으로 $650^{\circ}C$ 에서 annealing 하여 $100\%$ perovskite 구조를 가지는 치밀하고 crack 이 없는 PLT(28) 박막을 얻었다. $Pt/Ti/SiO_2/Si$ 기판 위에 PLT(28) 박막을 형성하여 전기적 특성을 측정하였다. 그 결과 유전 상수와 누설전류밀도가 각각 936 과 $1.1{\mu}A/cm^2$ 으로 측정되었다.