Browsing 04. LECTURERS ACADEMIC ACTIVITIES by Author "HATA, SATOSHI"
Now showing items 1-11 of 11
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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 ... -
FABRICATION OF MULTILAYERED MGB2/NI THIN FILMS AND THEIR FLUX PINNING PROPERTIES
TSUKANO, YUTAKA; DOI, TOSHIYA; YAMASHITA, HIROKI; TANAKA, AKIRA; IWASAKI, IKUMI; HAKURAKU, YOSHINORI; KITAGUCHI, HITOSHI; TAKAHASHI, KEN-ICHIRO; SOSIATI, HARINI; HATA, SATOSHI; IKEDA, KEN-ICHI; NAKASHIMA, HIDEHARU (IEEE, 2009)We prepared the multilayered MgB2/Ni thin films with the Ni layer spacings of 32, 23 and 16 nm. The multilayer nanostructure was confirmed to be obtained from the scanning transmission electron microscope observation. The ... -
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 ... -
REMOVING FOCUSED ION-BEAM DAMAGES ON TRANSMISSION ELECTRON MICROSCOPY SPECIMENS BY USING A PLASMA CLEANER
HATA, SATOSHI; SOSIATI, HARINI; KUWANO, NORIYUKI; ITAKURA, MASARU; NAKANO, TAKAYOSHI; UMAKOSHI, YUKICHI (OXFORD Academic, 2006-03-01)A plasma cleaner is usually used for removing carbonaceous debris from a specimen and preventing contamination during transmission electron microscopy (TEM) imaging and analysis. However, the plasma cleaner can be effectively ... -
TIN WHISKER FORMATION ON A LEAD-FREE SOLDER ALLOY STUDIED BY TRANSMISSION ELECTRON MICROSCOPY
SOSIATI, HARINI; KUWANO, NORIYUKI; HATA, SATOSHI; IWANE, Y; MORIZONO, Y; OHNO, Y (IEEE, 2006-12-06)Tin whiskers grown on a Sn/Cu-plated Polyimide (PI)-flexible substrate are a serious problem in electronic industrial application, because the whiskers lead to catastrophic electrical short circuit failures. Here, we report ... -
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, ...