• Title/Summary/Keyword: Cu Powder

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A Study on the Fabrication of Bi System Thick Film Using Melting Process (용융법에 의한 Bi계 Thick Film 합성)

  • Lee, Sang-Heon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.9
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    • pp.1775-1777
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    • 2009

  • BiSrCaCuO films were prepared on MgO single substerate at $885^{\circ}C$ by melt process. The films showed superconductivity above liquid nitrogen temperature (Tc= 96K). To investigate the effect of a melting temperature on the forming of the surface texturing, the samples were prepared under various temperature. The used powder was of high Tc phase. It is implies that the origin of the properties due to the heat treatment.

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Electron Spin Resonance Studies of Mn(+2), Gd(+3) and Cu(+2) in Chalcogenide Glasses ($Al_2S_3-La_2S_3$ System)

  • Lee, Chul-Wee
    • Journal of the Korean Magnetic Resonance Society
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    • v.6 no.2
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    • pp.113-117
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    • 2002

  • The chalcogenide glass (ALS, $Al_2S_3-La_2S_3$) was prepared by melting a stoichiometric mixture of aluminum powder and $La_2S_3$ under $H_2S$ atmosphere at $1200{\circ}C$. Glasses containing 0.1-0.1% of $Mn^{2+},\;Gd^{3+}$ and $Cu^{2+}$ were also prepared. The characteristic features of the ESR spectra for the transition metal containing ALS glasses are interpreted.

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Fabricatiion and Characterization of ${Bi_2}{Sr_2}{CaCu_2}{O_8}$ Superconductor Thick Films on Cu Substrates using Cu-free Precursors (Cu-free 전구체를 이용하여 구리 기판 위에 ${Bi_2}{Sr_2}{CaCu_2}{O_8}$ 초전도 후막의 제조 및 특성)

  • 한상철;김상준;한영희;성태현;한병성
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.4
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    • pp.349-358
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    • 2000

  • Fabrication and Characterization of Bi$_{2}$/Sr$_{2}$/CaCu$_{2}$/O$_{8}$(Bi2212) superconductor thick films were fabricated successfully on C tapes by liquid reaction between Cu-free precursors of Bi$_{x}$/SrCaO/$_{y}$(x=1.2-2) and Cu tapes. Cu-free Bi-Sr-Ca-O powder mixtures were screen-printed on Cu tapes and heat-treated at 850-87$0^{\circ}C$ for several minutes in air oxygen nitrogen and low oxygen pressure. In order to obtain the optimum heat-treatment condition we studied the effect of the precursor composition the printing thickness and the heat-treatment atmosphere on the superconducting properties of Bi2212 films and the reaction mechanism. Microstructures and phases of thick films were analyzed by films and the reaction mechanism. Microstructures and phases of thick films were analyzed by optical microscope and XRD. The electric properties of superonducting films were examined by the four probe method. At heat-treatment temperature the thick films were in a partially molten state by liquid reaction between CuO of the oxidized copper tape and the precursors which were printed on Cu tapes. During the heat-treatment procedure Bi2212 superconducting particle nucleate and grow in preferred orientations.ons.s.

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Powder EL device with 7-segment type and Driving Circuit (7-segment형 후막 EL소자와 구동회로)

  • 이종찬;박대희
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2000.11a
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    • pp.60-63
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    • 2000

  • In this paper, 7-segment was implemented using AC powder EL. ZnS:Cu and BaTiO3 was used as a phosphor and dielectric respectively. The preparation of phosphor and dielectric layer was performed with screen printing. The implemented system of 7-segment was divided as following; EL display, driving circuit, software for driving. The properties of fabricated devices was measured with EL spectrum and brightness.

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