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Carbon Content Influences on Superconductivity of BSCCO HTS by SSR and SHS
Soh, Dea-Wha,Korobova, Natalya,Zhanguo, Fan 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - Bi_2Sr_2CaCu_2Ox was prepared by the conventional method of Solid State Reaction(SSR) and Self-propagating High-temperature Synthesis(SHS) method. The samples were annealed in different atmosphere in order to examine the influences of atmospheres on the carbon contents in the Bi_2Sr_2CaCu_2Ox compound. The lowest carbon content in Bi_2Sr_2CaCu_2Ox could be attended when the sample was annealed in O_2 at 800℃ for 100 hours. The CO_2 in air pollute the samples and increase the carbon content in the sintering process. The critical current density of the Bi_2Sr_2CaCu_2Ox samples will decrease with the increasing carbon contents in the samples. The impurity carbon will deposit in the grain boundary, which makes lower critical current density.
소대화,코로보바 나탈리아,조용준,이영매 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
High-Tc superconductor films of YBa2Cu3O7-x were fabricated by electrophoretic deposition (EPD) from alcohol-based suspension, It is very important to select suspension solution for forming electrophoretic deposited YBCO thick film, because it is heavily affected to its superconducting properties. For the formation of YBCO dense and adherent coating on a silver wire by EPD, 1% PEG(1000) 2㎖, as a additive for making their surface crack-free, was used for electrophoresis. In this paper, high-temperature superconductor films of YBa2Cu3O7-x were fabricated by electrophoretic deposition (EPD) from alcohol-based suspension such as iso-propanol, iso-butanol, and their mixture. As a results, the cracks were considerably decreased and the superconducting critical current density (Jc) without/with PEG was 1200 A/㎠ and 2020 A/㎠, which films deposited in 30% iso-PrOH and 70 % iso-BuOH suspensionin mix iso-propanol and iso-butanol suspension.
액상-고상반응법과 자기전파고온합성법에 의한 YBCO 초전도체의 특성
蘇大和,코로보바 나탈리아,金泰完 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
In this paper, instead of YBCO superconductor that used Solid State Reaction method, we propose the construction method using Liquid-Solid State Reaction and Self-propagating High-temperature Synthesis(SHS) method. We developed the SHS method using BaO2 and the liquid-solid state reaction method using BaO, rather than BaCO3, which using YBCO superconductor in solid state reaction method. YBCO superconductor, which was produced through presented method in the above section, using wish the XRD, we can be observed superconductor phase and inspected the superconductivity with producing wire deposition through exectrophoretic deposited, measuring critical temperature and critical current. After measurement of experiment, liquid-solid state reaction and SHS method can be proved excellent 123 phase, critical temperature, which is 92 K and 90 K can be proved better than solid state reaction method's 86 K. Critical current measured by four-probe method can be acquired 0.65 A in solid state reaction, 0.76 A in liquid-solid state reaction, and 0.73 A in SHS method. Each critical current density can be acquired 830 A/㎠, 970 A/㎠, 930 A/㎠(77 K, 0 T) by calculation.
Fast Preparation of BSCCO Superconductor by Self-propagation High-temperature Synthesis
Soh, Deawha,Cho, Yongjoon,Park, Seongbeom,Soh, Hyunjoon,Korobova, N. 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - The BSCCO superconductor materials of using Self-propagating High-temperature Synthesis (SHS) were studied. Mechano-chemical activation - as a pretreatment of the reactants mixture - strongly influences the kinetic parameters, the reaction mechanism, and the composition and structure of the final product. In this paper as an effort for fabricating the SHSed BSCCO superconductor power by SHS method was considered to application in the synthesis of high temperature superconducting materials.