Nihon Kessho Gakkaishi
Online ISSN : 1884-5576
Print ISSN : 0369-4585
ISSN-L : 0369-4585
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Volume 24, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Crystallography of Non-crystalline Solids
    -a reflection on the structure model of perfect amorphous solids
    Kenji DOI
    1982Volume 24Issue 4 Pages 195-205
    Published: July 30, 1982
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.24.195
    JOURNAL FREE ACCESS
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    The implications of the dense random packing (DRP) model are discussed, with an expectation that it may represent a possible structure model for perfect amorphous solids. The topological definition of the DRP is argued on the basis of Sadoc's idea that the DRP is an assembly of spheres, close-packed in a curved non-Euclidean space and mapped onto the linear Euclidean space. Thermal properties of the DRP, especially excess entropy, are also discussed in this context. Discussions are evidenced by the observed changes in structures and thermal properties of metallic glasses due to particle bombardments and cold works. Similar arguments prove to apply for systems such as amorphous silicon and amorphous silica.
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  • Grain Boundaries of Ceramics
    Yusuke MORIYOSHI, Yoshio BANDO
    1982Volume 24Issue 4 Pages 206-216
    Published: July 30, 1982
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.24.206
    JOURNAL FREE ACCESS
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    The recent applications of a conventional transmission electron microscope (TEM) and an analytical electron microscope (AEM) to studying ceramic grain boundaries are reviewed. Dislocation structures at small angle grain boundaries and the difficulty in observing general high angle grain boundaries with TEM are presented by using examples of micrographs observed. Elemental analysis data of Sialon and phase separated glass with AEM are also described.
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  • On the formation mechanism of snow polycrystals
    Toru TAKAHASHI
    1982Volume 24Issue 4 Pages 217-225
    Published: July 30, 1982
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.24.217
    JOURNAL FREE ACCESS
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    To clarify the formation mechanism of snow polycrystals, which have the misorientation of c-axis at 70.5°, the possibility of formation of a cubic ice nucleus (diamond structure) is discussed on the basis of the homogeneous nucleation theory for supercooled water formed in the phase of supersaturated vapour. From the difference of specific interfacial energy between a hexagonal ice and a cubic ice, it follows that a critical cubic nucleus has a smaller activation energy than a critical hexagonal nucleus below a critical temperature ; namely, Ostwald's step rule (Stufenregel) holds for a change from cubic ice to hexagonal ice below a critical temperature.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1982Volume 24Issue 4 Pages 226-231
    Published: July 30, 1982
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.24.226
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1982Volume 24Issue 4 Pages 232-236
    Published: July 30, 1982
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.24.232
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1982Volume 24Issue 4 Pages 236-237
    Published: July 30, 1982
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.24.236
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1982Volume 24Issue 4 Pages 237-239
    Published: July 30, 1982
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.24.237
    JOURNAL FREE ACCESS
    Download PDF (1976K)
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