• 제목/요약/키워드: Transparent ceramic

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Synthesis of Langasite Powder by a Chemical Route

  • Kim, Kyoung-Jin;Kim, Jung-Hwan;Kim, Young-Do;Joo, Kwang-Suk;Shin, Kun-Chul;Auh, Keun-Ho
    • 한국결정성장학회:학술대회논문집
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    • 한국결정성장학회 1998년도 PROCEEDINGS OF THE 14TH KACG TECHNICAL MEETING AND THE 5TH KOREA-JAPAN EMGS (ELECTRONIC MATERIALS GROWTH SYMPOSIUM)
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    • pp.105-109
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    • 1998

  • Langasite({{{{ { La}_{ 3} {Ga }_{5 } {SiO }_{14 } , LGS}}}}) powder was prepared by a polymerized complex method based on the Pechini-type reaction. A mixed solution of ethylene glycol(EG), cotric acid(CA), lanthanum, gallium and silicon ions, with a molar ratio of EG:CA:La:Ga:Si=100:25:3:5:1, was polymerzed to from a transparent resin, which was used as a precursor for the synthesis of LGS. X-ray diffraction(XRD) patterns indicated that the LGS phase could be formed by the heat-treatment in air at 1000$^{\circ}C$ for 3hrs

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석탄폐석을 이용한 소다라임계 컬러유리의 광학적 특성 (Optical Properties of Soda-lime Color Glass Fabricated by Using Refused Coal Ore)

  • 임태영;정상수;황종희;김진호;김정국
    • 한국재료학회지
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    • 제20권10호
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    • pp.524-534
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    • 2010

  • Glass was fabricated using refused coal ore obtained from the Dogye coal mine in Samcheok. We additionally used soda ash and calcium carbonate to make a glass with the chemical composition of soda-lime glass, and we also used white, brown, and green glass cullet to make various kinds of colored glass. Transparent glass was fabricated by melting batch materials including refused coal ore at $1550^{\circ}C$ for 1 hr in an electrical furnace. The light transmittance and color chromaticity were measured by a UV/VIS/NIR spectrometer. Transparent glass with a light transmittance of over 80% was fabricated using normal refused coal ore and white glass cullet. Various kinds of colored glass with a light transmittance of 30-80% were fabricated using refused coal ore and brown or green glass cullet. The light transmittance of the mixed color glass samples, fabricated using normal refused coal ore and brown glass cullet and green glass cullet, indicated 30-47%, a relatively low value, in the condition of a cullet ratio of 20-50%. The characteristics of the color chromaticity of the glass samples were indicated in a chromaticity diagram by x-coordinates, y-coordinates, Y (lightness). The values of x-coordinates and y-coordinates were moved with a regular directional property according to the kind and amount of glass cullet. Therefore, we concluded that refused coal ore can be used for raw materials of color glass products like art glass and glass tile.

  • https://doi.org/10.3740/MRSK.2010.20.10.524 인용 PDF KSCI

투명 전도성 코팅체의 전자기적, 광학적 성능 설계 및 분석에 관한 연구 (A Study on Design of an Electromagnetic and Optical Characteristics in Transparent Conductor Coated Structures)

  • 조성실;윤영준;황민제;최광식;홍익표
    • 한국군사과학기술학회지
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    • 제27권1호
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    • pp.15-23
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    • 2024

  • In order to avoid the high observability due to the cavity resonance or electromagnetic wave leakages from the bridge of a battleship or the cockpit of an aircraft, this paper presents a transparent conductive oxide coated structure to prevent the incoming/outgoing electromagnetic waves. Currently, most of the RCS reduction technologies were focused on radar absorbing material such as paints based on conductive or magnetic materials in the fuselage, and there is not much research on countermeasures for achieving the low observability of materials that required optical transparency in actual weapon systems. In this study, the transmission/reflection and absorption performance of the ITO coated structure according to the change of the surface resistance of the transparent conductor were analyzed. Finally, the relationship between the electromagnetic and optical characteristics was established through fabrication and measurement.

  • https://doi.org/10.9766/KIMST.2024.27.1.015 인용 PDF