Poster paper Synchrotron radiation X-ray diffraction analysis for Bi-based oxide superconducting wire S. UEMURA 1 † , J. IIHARA 1 , Y. SAITO 1 , K. YAMAGUCHI 2 , J. MATSUMOTO 1 , K. YAMAZAKI 3 , M. KIKUCHI 3 , T. NAKASHIMA 3 , S. KOBAYASHI 3 , N. AYAI 4 , K. HAYASHI 4 AND K. SATO 5 1 Sumitomo Electric Industries, Ltd., Materials and Process Technology R&D Unit Analysis Technology Research Center 2 Sumitomo Electric Industries, Ltd., Materials and Process Technology R&D Unit Automotive Technology R&D Laboratories 3 Sumitomo Electric Industries, Ltd., Supreconductivity and Energy Technology department 4 Sumitomo Electric Industries, Ltd., Materials and Process Technology R&D Unit Electric Power & Energy Research Laboratories 5 Sumitomo Electric Industries, Ltd., Materials and Process Technology R&D Unit (Received 18 June 2010; revised 30 August 2010; accepted 29 September 2010) The Bi-based oxide superconducting wire is one of the most promising materials for practical uses such as electric power transmission, electromagnets and so on. For the higher performances required in these applications, it is necessary to increase the critical current (I c ). We have carried out synchrotron radiation X-ray diffraction analysis to improve our manufacturing processes and thus to achieve higher I c . We have performed in situ X-ray diffraction measurements during the sintering and cooling processes, and observed the decrease of Bi-2223(=(Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O x ) phase during the cooling process. We have also evaluated the distribution of the crystal orientation in whole wire thickness, by measuring the rocking curves. We have observed that the distribution of the crystal orientation is improved by a refinement of the process conditions. 1. Introduction The high-temperature superconductor whose critical temperature (T c ) is higher than the liquid-nitrogen temperature was discovered in 1987. Then various studies were conducted for practical use. We succeeded in improving the critical current and the mechanical properties of the Bi-based superconducting wire innovatively by introducing the ConTrolled-Over Pressure (CT-OP™) (Ayai et al. 2006a, b; Kato et al. 2006) sintering process in 2004. These wires are used for an electrical power cable, a motor, a transformer and a magnet. The improvement of critical cur- rent, which is one of the performance indices of superconducting wire, is essential † Email address for correspondence: uemura-shigeaki@sei.co.jp Diamond Light Source Proceedings, Vol 1, e108, page 1 of 4 © Diamond Light Source Ltd 2010 SRMS-7 2010 doi:10.1017/S2044820110000444 https://www.cambridge.org/core/terms. https://doi.org/10.1017/S2044820110000444 Downloaded from https://www.cambridge.org/core. IP address: 207.241.231.83, on 30 Oct 2018 at 07:41:40, subject to the Cambridge Core terms of use, available at