Nihon Kessho Gakkaishi
Online ISSN : 1884-5576
Print ISSN : 0369-4585
ISSN-L : 0369-4585
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Volume 26, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • Problems concerning B1-B2 Phase Transition of Ionic Crystals
    Bin OKAI
    1984Volume 26Issue 3 Pages 157-168
    Published: May 30, 1984
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.26.157
    JOURNAL FREE ACCESS
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    Based on the supposition that the non-diffusive solid-solid phase transition of the first order is also triggered by soft phonon, a study was made. Orientation relation between B1 and B2 structures was found to exist for alkali halides across the pressureinduced transition. Calculations show instability of TA [100] mode of B1 structure at high pressures. Energy barriers opposing the transition are calculated to be low enough at the equilibrium pressure, enabling transition at 0°K to take place at a reasonable value of pressure in agreement with experimental results of Laukhin et al. [J. Cryst. Soc. Jpn. 26, 157 (1984) ] .
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  • Crystal Chemistry of Metal Hydrides
    Hajime ASANO
    1984Volume 26Issue 3 Pages 169-175
    Published: May 30, 1984
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.26.169
    JOURNAL FREE ACCESS
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    Crystal structures of tantalum hydrides have been reviewed.The Ta-H system is characteristic of an interstitial alloy of hydrogen in bcc tantalum over a wide composition range. Hydrogen atoms in the interstitial sites become ordered at low temperatures and superstructures β1-Ta2H, β2-Ta2H, γ-Ta4H3 and δ-TaH are formed. These super-structures are closely related and transform to one another with hydrogen composition and temperature. The crystal structure of β1-Ta2H is discussed in detail on the basis of the recent neutron and X-ray diffraction work. [J. Cryst. Soc. Jpn. 26, 169 (1984) ] .
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  • Structure and Decomposition Process of Fe84B16 Amorphous Alloy.
    Yoshihiko HIROTSU
    1984Volume 26Issue 3 Pages 176-185
    Published: May 30, 1984
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.26.176
    JOURNAL FREE ACCESS
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    An investigation on the structure and its decomposition process of an Fe84B16 amorphous alloy by transmission electron microscopy is described. Under an optimum defocus condition, bcc-like microcrystalline domains with a size of about 12 Å were observed by the lattice imaging even in an as-quenched specimen. They were found to grow up to a size about 20 Å on annealing near 300°C. A formation of a halo electron diffraction pattern from the specimens with densely formed microcrystalline domains was explained on the basis of a large lattice distortion of microcrystals. A large amount of inclusion of boron atoms in α-iron precipitates in the early stage of precipitation at 350°C was found by the use of selected area electron diffraction.
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  • X-Ray Powder Diffraction under the Hydrothermal Condition
    Masahiro AOKI, Chihiro MATSUURA, Norihiko FUJITA
    1984Volume 26Issue 3 Pages 186-191
    Published: May 30, 1984
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.26.186
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  • [title in Japanese]
    [in Japanese]
    1984Volume 26Issue 3 Pages 192-196
    Published: May 30, 1984
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.26.192
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1984Volume 26Issue 3 Pages 196-200
    Published: May 30, 1984
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.26.196
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1984Volume 26Issue 3 Pages 200-201
    Published: May 30, 1984
    Released on J-STAGE: September 30, 2010
    DOIhttps://doi.org/10.5940/jcrsj.26.200
    JOURNAL FREE ACCESS
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