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  • 1980-1984  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Fractionation of sulfur isotopes and selenium between coexisting sulfide minerals from the Besshi deposit, Central Shikoku, Japan (1984)
    Springer
    Mineralium deposita 19 (1984), S. 237-242 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Fractionation of sulfur isotopes and selenium was measured between coexisting pyrite and chalcopyrite and between coexisting pyrrhotite and chalcopyrite from the Besshi deposit of Kieslager-type, Central Shikoku, Japan. In all the pyrite-chalcopyrite pairs studied, 34S is enriched in pyrite relative to chalcopyrite, while selenium is enriched conversely in chalcopyrite relative to pyrite. The mean △34Spy-cp value is +0.53±0.36 per mil, and the mean value of the distribution coefficient of selenium, Dcp-py, is 2.58±0.64. In all the pyrrhotite-chalcopyrite pairs studied, the two minerals are very close to each other both in sulfur isotope and Se/S ratios. The mean △34Spo-cp value is −0.08±0.16 per mil and the mean Dcp-po value is 0.99±0.05. The results have been discussed in comparison with similar data obtained for the Hitachi deposits of Kieslager-type, Japan (Yamamoto et al. 1983).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00199790
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of LaB6 from BN and lanthanum-citrate-hydrate (1980)
    Springer
    Journal of materials science 15 (1980), S. 1987-1992 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Lanthanum hexaboride was synthesized by reacting a powdered mixture of hexagonal boron nitride and lanthanum-citrate-hydrate carbonized substance which had been prepared by heating lanthanum-citrate-hydrate at 1000° C in a nitrogen atmosphere. The optimum conditions for the synthesis were a ratio of boron to lanthanum in the starting mixture between 5.0 and 6.0 with heating in the temperature range 1480 and 1600° C in an evacuated atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550624
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phase separation and structural change accompanying the introduction of silver to arsenic trisulphide glass (1982)
    Springer
    Journal of materials science 17 (1982), S. 2431-2434 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Glass-glass phase separation has been observed when melts of compositions As2S3Agx (x=0.1, 0.25, 0.35, 0.4 or 0.5) were cooled slowly to 210° C and annealed at this temperature. The two glass phases produced were an Ag-rich one (approximate compositon for x=0.4, As2S3.4Ag1.0) and an Ag-poor one (As2S2.7Ag0.07). With increasing x value, Ag and S contents in the Ag-rich phase increased, and its composition approached that of trechmannite or smithite (AgAsS2), whereas the Ag content of the Ag-poor phase changed little and only the S content decreased. A chemical-etching study of the phaseseparated glasses was also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543755
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    Paper (German National Licenses)
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