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  • phase differentiation  (2)
  • Industrial Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Color indicator of cuprate superconductivity observed by polarized light microscopy (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 351-359 
    Details
    ISSN: 1572-9605
    Keywords: Cuprates ; superconductivity ; optical microscopy ; phase differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A common mineralogical technique for identifying individual crystals in a heterogeneous, polycrystalline sample involves the observation at room temperature of their colors in reflected polarized light (colors of polarization). Here we present the observation that a brownish yellow (golden) color of polarization is not only characteristic of the YBa2Cu3O7 superconductor, but of the cuprate superconductors in general and is correlated with the occurrence of superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618522
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  • 2
    Electronic Resource
    Electronic Resource
    Optical differentiation of orthorhombic superconductors such as YBa2Cu3O7 from their tetragonal precursor material (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 35-44 
    Details
    ISSN: 1572-9605
    Keywords: ErBa2Cu3O7 ; superconductivity ; optical microscopy ; phase differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The orthorhombic superconducting phase of YBa2Cu3O7 is shown to be differentiable from its tetragonal precursor by optical microscopy. Individual grains 1 μm in diameter or larger are found to either exhibit the color of the compensator in reflected polarized light (tetragonal material) or to change colors from the compensator (orthorhombic material). By using color differences, retained tetragonal material and the orthorhombic nature of untwinned areas of grains are identified. The advantage to producing better superconducting single crystals and sintered polycrystalline materials is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617949
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  • 3
    Electronic Resource
    Electronic Resource
    Elektrochemische Untersuchungen an Kohle-Elektroden (1965)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 37 (1965), S. 639-643 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden Messungen der Überspannung von Wasserstoff, Chlor und Sauerstoff an Graphit-Elektroden mitgeteilt. Die Überspannung des Wasserstoffs ist Durchtrittsüberspannung. Die Überspannung des Chlors ist vorwiegend Diffusionsüberspannung. Die Überspannung des Sauerstoffs aus wäßrigen Lösungen ist vorwiegend Konzentrationsüberspannung. Die Austauschstromdichten bei der Abscheidung von Wasserstoff sind sehr klein, dagegen bei der Abscheidung von Chlor und Sauerstoff sehr hoch. Die Überspannung des Sauerstoffs bei der Abscheidung aus geschmolzenen Salzen ist vorwiegend Reaktions- und Diffusionsüberspannung. Die Austauschstromdichte bezogen auf 1 Mol O2--Ionen pro Liter Schmelze beträgt 400 mA/cm2; der Durchtrittsfaktor ist 0,2.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330370614
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