Mineralogical Journal
Online ISSN : 1881-4174
Print ISSN : 0544-2540
ISSN-L : 0544-2540
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Volume 4, Issue 5
Displaying 1-4 of 4 articles from this issue
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  • SILICON CARBIDE CRYSTALS GROWN IN NITROGEN ATMOSPHERE
    TSUTOMU KAWAMURA
    1965 Volume 4 Issue 5 Pages 333-355
    Published: 1965
    Released on J-STAGE: March 18, 2008
    DOIhttps://doi.org/10.2465/minerj1953.4.333
    JOURNAL FREE ACCESS
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    Silicon carbide crystals grown in atmosphere containing nitrogen were studied by X-ray and electrical measurements. As the first result, it was shown that with the increase of nitrogen in argon atmosphere, the quantity of the 3C polytype in the grown crystals increases and finally, in pure nitrogen atmosphere, 3C becomes dominant with a trace of 6H.
    Next, the difference Fourier synthesis, together with the measurements of the lattice constants and the electrical properties, offered a probable explanation of this dominancy of 3C that nitrogen atoms incorporated interstitially in the structure play a rôle of preventing the 3C structure from transforming into α-silicon carbide structures.
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  • ON THE SINTERING MECHANISMS OF MAGNESIUM OXIDE
    NOBORU TODA
    1965 Volume 4 Issue 5 Pages 356-373
    Published: 1965
    Released on J-STAGE: March 18, 2008
    DOIhttps://doi.org/10.2465/minerj1953.4.356
    JOURNAL FREE ACCESS
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    Microscopic observations and X-ray diffraction study were carried out on the sintered products of magnesium oxide. A new monoclinic phase mainly appearing at the contact boundaries between crystal particles was discovered and adhesion of crystal particles during sintering was concluded to be due either to parallel-growth and twinning of the crystals or to the cementing effect of the monoclinic phase.
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  • FURTHER OBSERVATIONS ON SINTERED MAGNESIUM OXIDE
    NOBORU TODA
    1965 Volume 4 Issue 5 Pages 374-379
    Published: 1965
    Released on J-STAGE: March 18, 2008
    DOIhttps://doi.org/10.2465/minerj1953.4.374
    JOURNAL FREE ACCESS
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    Following the previous paper, further microscopic observations were carried out on sintered magnesium oxide. It was confirmed that the monoclinic phase appears mainly along grain-boundaries, thus supporting the view described in the previous paper.
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  • THE STRUCTURE OF JIMBOITE, Mn3(BO3)2 AND RELATIONSHIP WITH THE STRUCTURE OF KOTOITE
    RYOICHI SADANAGA, TOSHIO NISHIMURA, TAKEO WATANABE
    1965 Volume 4 Issue 5 Pages 380-388
    Published: 1965
    Released on J-STAGE: March 18, 2008
    DOIhttps://doi.org/10.2465/minerj1953.4.380
    JOURNAL FREE ACCESS
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    The crystal structure of jimboite, Mn3(BO3)2, was determined with the aid of three-dimensional least squares and Fourier syntheses. It consists of BO3-groups and octahedral coordinations of oxygen ions around manganese ions and is almost strictly isostructural with kotoite, in spite of the difference in size between manganese and magnesium ions. In these structures, compact BO3-groups are almost solely responsible for the deviations in the array of oxygen ions from hexagonal closest-packing, and accordingly the effect of the difference in size of the cations upon the structures is obscured.
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