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  • Electronic Resource  (3)
  • 1995-1999  (3)
  • lithium borate  (2)
  • morphology  (1)
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  • Electronic Resource  (3)
Years
  • 1995-1999  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Electrical Properties of Polycrystalline Lithium Chloroboracite Prepared by the Sol-Gel Method (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 223-227 
    Details
    ISSN: 1573-4846
    Keywords: lithium boracite ; lithium-ion conductor ; complex impedance method ; by-products ; morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrical properties of polycrystalline lithium chloroboracite, Li4B7O12Cl, prepared by the sol-gel method were investigated in connection with their structure. Li4B7O12Cl pellets were prepared with different amounts of hydrochloric acid or ammonium chloride. The kind and amount of the chlorine source affected the formation of by-products (Li2B4O7, LiCl, a glass phase) and the morphology of the Li4B7O12Cl pellets. Thus their conductivity, which is dominated by grain boundary response owing to the high porosity of the materials, was also affected. The formation of Li2B4O7 as a by-product led to a higher activation energy and lower conductivity. In those pellets in which Li2B4O7 did form, an increase of the amount of glass phase led to higher conductivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008665119392
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Acids on Crystallization of Lithium Borate Films (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 431-435 
    Details
    ISSN: 1573-4846
    Keywords: lithium borate ; addition of acid ; suppressor mechanism of crystallization ; boron-containing species ; residual carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Lithium borate films in amorphous and crystalline(Li2B4O7)states were prepared from alkoxide solutions hydrolyzed in thepresence or absence of hydrochloric acid or acetic acid. The acidssuppressed crystallization of the amorphous films intoLi2B4O7, with acetic acid being the stronger suppressor. Inorder to determine the suppressing mechanism, we investigated thedistribution of boron-containing species in the solutions by 11B-NMR. Boron in the non-acidified solution existed as bothB(OH) $$_4^ - $$ and polyborate species, includingB4O5(OH) $$_4^{2 - } $$ , which is easilytransformed into the crystalnucleous of Li2B4O7. In the solutionscontaininghydrochloric acid or acetic acid, however, boron was present mainlyas B(OH)3 and the formation of the polyborate species wassuppressed, leading in turn to the suppression of crystallizationinto Li2B4O7. X-ray fluorescence analysis showed thatacetic acid produced a larger amount of residual carbon in the filmsthan did hydrochloric acid. We concluded that the residual carbonalso inhibited crystallization of the films intoLi2B4O7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026413202998
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effect of acids on crystallization of lithium borate films (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 431-435 
    Details
    ISSN: 1573-4846
    Keywords: lithium borate ; addition of acid ; suppressor mechanism of crystallization ; boron-containing species ; residual carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Lithium borate films in amorphous and crystalline (Li2B4O7) states were prepared from alkoxide solutions hydrolyzed in the presence or absence of hydrochloric acid or acetic acid. The acids suppressed crystallization of the amorphous films into Li2B4O7, with acetic acid being the stronger suppressor. In order to determine the suppressing mechanism, we investigated the distribution of boron-containing species in the solutions by11B-NMR. Boron in the non-acidified solution existed as both B(OH) 4 − and polyborate species, including B4O5(OH) 4 2− , which is easily transformed into the crystal nucleous of Li2B4O7. In the solutions containing hydrochloric acid or acetic acid, however, boron was present mainly as B(OH)3 and the formation of the polyborate species was suppressed, leading in turn to the suppression of crystallization into Li2B4O7. X-ray fluorescence analysis showed that acetic acid produced a larger amount of residual carbon in the films than did hydrochloric acid. We concluded that the residual carbon also inhibited crystallization of the films into Li2B4O7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436878
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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