Browsing 04. LECTURERS ACADEMIC ACTIVITIES by Author "MATSUMOTO, AKIYOSHI"

Now showing items 1-8 of 8

    • EFFECT OF BALL-MILLING TREATMENT ON MICROSTRUCTURE OF IN SITU POWDER-IN-TUBE (PIT) MGB2 TAPE 

      SOSIATI, HARINI; HATA, SATOSHI; MATSUMOTO, AKIYOSHI; KITAGUCHI, HITOSHI; KUMAKURA, HIROAKI (American Institute of Physics (AIP), 2012-06-25)
      In an in situ powder-in-tube (PIT) fabrication of MgB2 superconducting tapes, it has been found that ball-milling treatment on a starting powder is effective for improving critical current density (Jc) of the MgB2 tapes. ...

    • EFFECTS OF HEAT TREATMENTS ON MICROSTRUCTURE FORMATION IN MGB 2 /YSZ/HASTELLOY FILM 

      HATA, SATOSHI; SOSIATI, HARINI; KUWANO, NORIYUKI; TOMOKIYO, YOSHITSUGU; MATSUMOTO, AKIYOSHI; FUKUTOMI, MASAO; KITAGUCHI, HITOSHI; KOMORI, KAZUNORI; KUMAKURA, HIROAKI (2005-06)
      Annealing processes in MgB2 films deposited on yttria-stabilized zirconia (YSZ)-buffered Hastelloy substrates were studied by transmission electron microscopy. The MgB2 films with Mg-rich compositions were fabricated at room ...

    • ELECTRON MICROSCOPY OF MGB2 THIN FILM ON YSZ-BUFFERED HASTELLOY 

      SOSIATI, HARINI; HATA, SATOSHI; KUWANO, NORIYUKI; TOMOKIYO, YOSHITSUGU; MATSUMOTO, AKIYOSHI; FUKUTOMI, MASAO; KITAGUCHI, HITOSHI; KOMORI, KAZUNORI; KUMAKURA, HIROAKI (Elsevier, 2004-06-11)
      In order to understand the relationship between the microstructures and superconducting properties of MgB2 films, analytical TEM observations have been carried out. The films were fabricated by a KrF excimer laser deposition ...

    • MgB fiLMS WITH VERY HIGH CRITICAL CURRENT DENSITIES DUE TO STRONG GRAIN BOUNDARY PINNING 

      KITAGUCHI, HITOSHI; MATSUMOTO, AKIYOSHI; KUMAKURA, HIROAKI; DOI, TOSHIYA; YAMAMOTO, HAJIME; SAITOH, KEISUKE; SOSIATI, HARINI; HATA, SATOSHI (American Institute of Physics, 2004-08-13)
      MgB2 superconductor has a great potential for applications because of its high Tc and Bc2, exceeding those of any Nb-base superconductors at any temperature. It is now important to understand its flux pinning so as to raise ...

    • MICROSTRUCTURES OF MGB2 /FE TAPES FABRICATED BY AN IN SITU POWDER-IN-TUBE METHOD USING MGH2 AS A PRECURSOR POWDER 

      HATA, SATOSHI; YOSHIDOME, TAKESHI; SOSIATI, HARINI; TOMOKIYO, YOSHITSUGU; KUWANO, NORIYUKI; MATSUMOTO, AKIYOSHI (IOP, 2006-01-04)
      Microstructures of MgB2/Fe tapes fabricated by an in situ powder-in-tube method using MgH2 as a precursor powder have been studied by means of x-ray diffraction and analytical transmission electron microscopy combined with ...

    • PROPERTIES OF MGB FILMS WITH VERY HIGH TRANSPORT CRITICAL CURRENT DENSITIES 

      KITAGUCHI, HITOSHI; DOI, TOSHIYA; KOBAYASHI, YUKI; MATSUMOTO, AKIYOSHI; SOSIATI, HARINI; HATA, SATOSHI; FUKUTOMI, MASAO; KUMAKURA, HIROAKI (IEEE, 2005-06)
      Magnesium diboride, MgB2, thin films are fabricated through two different kinds of process. One is an in-situ process by using electron beam deposition and the other is an ex-situ process by using the combination of pulsed ...

    • RELATIONSHIP BETWEEN MICROSTRUCTURE AND JC PROPERTY IN MGB2/Α-AL2O3 FILM FABRICATED BY IN SITU ELECTRON BEAM EVAPORATION 

      SOSIATI, HARINI; HATA, SATOSHI; KUWANO, NORIYUKI; TOMOKIYO, YOSHITSUGU; KITAGUCHI, HITOSHI; DOI, TOSHIYA; YAMAMOTO, HAJIME; MATSUMOTO, AKIYOSHI; SAITOH, KEISUKE; KUMAKURA, HIROAKI (IOP, 2005-08-09)
      A transmission electron microscopy (TEM) study has been carried out on an MgB2/α-Al2O3 film that exhibits the typical property of critical current density (Jc) under magnetic fields. The MgB2 layer of 300 nm in thickness ...

    • TRANSMISSION ELECTRON MICROSCOPY ANALYSIS OF C4H4S-doped MgB2 TAPES 

      YUZURIHA, N; SOSIATI, HARINI; HATA, SATOSHI; KUWANO, NORIYUKI; YAMADA, H; UCHIYAMA, N; MATSUMOTO, AKIYOSHI; KITAGUCHI, HITOSHI; KUMAKURA, HIROAKI (IOP, 2008)
      It has been reported that doping with aromatic hydrocarbons in an in situ powder-intube fabrication process of MgB2 tapes is effective for increasing the critical current density (Jc) under magnetic fields. In this study, ...