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  • 1
    Electronic Resource
    Electronic Resource
    Sol-gel preparation and fluorine substitution of BiSCCO high-T c superconductors (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 105-115 
    Details
    ISSN: 1572-8943
    Keywords: BiSCCO synthesis ; fluorine substitution ; sol-gel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Sol-gel citrate technology was used to prepare BiSCCO 2223 and 2212 superconducting phases. Fluorine in the initial mixture was shown to enhance considerably formation of the 2223 phase. Fluorine substitution of up to three F atoms per Bi(Pb)SCCO 2223 formula was achieved by treatment of the sample in 80 Torr ClF3 atmosphere. A number of experimental methods have been used to characterize the samples and to trace the phase transformations in the sol-gel process: DTA/TG, XRD, atomic absorption, potentiometry with fluoride selective electrode, magnetic susceptibility measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979553
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    Paper (German National Licenses)
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  • 2
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    Organic Chemistry in Interstellar Ices: Connection to the Comet Halley Results (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Mass spectroscopic measurements on the gas and dust in the coma of Comet Halley revealed the presence of considerable amounts of organic species. Greenberg (1973) proposed that prior to the formation of the comet UV processing of the ice mantles on grains in dense clouds could lead to the formation of complex organic molecules. Theoretical predictions of the internal UV field in dense clouds as well as the discovery in interstellar ices of species like OCS and OCN- which have been formed in simulation experiments by photoprocessing of interstellar ice analogues point to the importance of such processing. We undertook a laboratory simulation study of the formation of organic molecules in interstellar ices and their possible relevance to the Comet Halley results.
    Keywords: Astrophysics
    Type: Analysis of Returned Comet Nucleus Samples; 217-224; NASA/CP-1997-10152
    Format: text
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    NASA TECHNICAL REPORTS
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