TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1971, Issue 64
Displaying 1-6 of 6 articles from this issue
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  • Annealing effects on Galvanomagnetic Properties of Heavily Radiation-Damaged Graphite
    Takuro TSUZUKU, Shiro ARAI
    1971 Volume 1971 Issue 64 Pages 3-10
    Published: March 31, 1971
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1971.3
    JOURNAL FREE ACCESS
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    An annealing study of radiation damage in graphite has been made through the observation of the changes in electrical resistivity, Hall coefficient and magnetoresistance at room and liquid-nitrogen temperatures. The specimen examined was a pilegrade polycrystalline graphite bombarded with fast neutrons at 30°C to total dose of 5.8 × 1020 nvt. The isothermal annealing was performed in a stepwise manner at temperatures from 200°C up to 2400°C. The recovery diagrams are characterized by the presence of two major stages lying on the annealing temperature axis; the relatively small one around 300°C and the bigger around 1300°C. Based on a parabolic two-band representation for the electronic structure, through analyses have been made of the whole data, which lead to a coherent description of the recovery process in terms of the following parameters; the density and mobility of conduction carriers, the overlap of upper and lower bands and the location of the Fermi level. Discussions are also given in relation to the defect structure.
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  • On Multi-phase Graphitization of Charcoal
    Sugio Otani, Asao Oya
    1971 Volume 1971 Issue 64 Pages 10-13
    Published: March 31, 1971
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1971.10
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    In order to know the effect of the heterogeneity of wood on the multi-phase graphitization of charcoal, the residual products, which were obtained from a commercial pulp and an Araskan Cypress at various stages of solvent extraction, were heat-treated up to 3000°C.
    X-ray diffraction profiles of the residual products differed remarkably from each other.However, the variations of (002) diffraction profile of the products with heat treatment temperature was hardly observed and co-relation between the crystallinity of the materials before heating and characteristics of (002) profiles of char was not established.
    The present results show that the multi-phase graphitization of charcoal was not caused from explaned by the constitutional heterogeneity of wood.
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  • [title in Japanese]
    [in Japanese]
    1971 Volume 1971 Issue 64 Pages 14-21
    Published: March 31, 1971
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1971.14
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1971 Volume 1971 Issue 64 Pages 22-31
    Published: March 31, 1971
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1971.22
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  • [title in Japanese]
    [in Japanese]
    1971 Volume 1971 Issue 64 Pages 31-37
    Published: March 31, 1971
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.7209/tanso.1971.31
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  • Erratum
    1971 Volume 1971 Issue 64 Pages 31a
    Published: 1971
    Released on J-STAGE: July 05, 2011
    DOIhttps://doi.org/10.7209/tanso.1971.64_31a
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