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- 저자 : S.Awaji (검색결과 3 건)
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Magnetic field effects on synthesis process of high-Tc superconductors
S.Awaji,Y.Ma,W.P.Chen,H.Maeda,K.Watanabe,M.Motokawa 한국물리학회 2003 Current Applied Physics Vol.3 No.5
Materials synthesis processes in high magnetic fields are investigated for high-Tc superconductors at the High Field Laboratoryfor Superconducting Materials, Institute for Materials Research, Tohoku University. On a melt growth process of YBa2Cu3O7 bulkalso the decrease of the crystal growth rate by the magnetic field, which is suggested from a dierential temperature analysismeasurement in magnetic fields. On a chemical vapor deposition process of YBa2Cu3O7 lms deposited on the polycrystalline Agsubstrates in high magnetic elds, the microstructure changes drastically from the rectangular large grains with 10l m in size to thesmall complex shaped grains. The spiral growth mode is observed for the samples prepared at 0 T but it changes into the island2Sr2CaCu2O8 tapes in magneticelds, the homogeneous texture is obtained and it results in the increase of the critical current density.. 2003 Elsevier B.V.
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Shin, H. S.,Dedicatoria, M. J.,Gorospe, A.,Suwa, T.,Oguro, H.,Awaji, S. IEEE 2013 IEEE transactions on applied superconductivity Vol.23 No.3
<P>In this study, the reversible response of <I>I</I><SUB>c</SUB> with uniaxial strain in differently processed GdBCO coated conductor tapes with different substrates has been investigated under self field and magnetic field conditions at 77 K. Higher irreversible strain limit, ε<SUB>irr</SUB> was observed in those samples with stainless steel substrate. Additional brass lamination to the Cu-stabilized samples produced enhancement of both ε<SUB>irr</SUB> and endurable load limit. However, no significant widening of the <I>I</I><SUB>c</SUB>/<I>I</I><SUB>c0</SUB>-tensile strain window with brass addition was observed in the case of samples having stainless steel substrate. Furthermore, under magnetic field, the <I>I</I><SUB>c</SUB> degradation behavior was independent on the kind of substrate material, but varied with the kind of manufacturing process adopted. The GdBCO samples showed different <I>I</I><SUB>c</SUB> peak positions and degradation behavior depending on the level of magnetic field applied.</P>
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Hyung-Seop Shin,Dedicatoria, M. J.,Awaji, S.,Watanabe, K. IEEE 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>SmBCO and YBCO coated conductors (CC) showed different critical current, I<SUB>c</SUB> degradation behavior with strain showing different I<SUB>c</SUB> peak position under self field. Strain effect on I<SUB>c</SUB> under magnetic field in REBCO CC tapes was investigated in order to measure and to describe its tolerance and degradation behavior. Katagiri-type tensile testing apparatus was adopted in which magnetic field was applied parallel to the c-axis of coating film using 10 T superconducting magnet at 77 K. Both strain gauge and Nyilas double extensometers were used to measure the strain. In all the REBCO CC tapes investigated, I<SUB>c</SUB>(ε, B) strongly depends on magnetic field and their degradation behavior depends on the kind of HTS film and fabrication technique adopted. Differently with YBCO CC tapes, SmBCO CC tapes showed increasing I<SUB>c</SUB> strain sensitivity with increasing magnetic field at 77 K and the irreversible strain limit was magnetic field independent over the entire field range studied.</P>
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