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  • 1
    ISSN: 1572-9605
    Keywords: Single crystals ; high pressure synthesis ; structure ; HgBaCaCuO, CaCuO2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single crystals of Hgl-xPbxBa2Can-lCunO2n+2+ς(x=0,0.2,0.5; n=2,3,4,5) and infinite layer CaCuO2 compounds have been grown using a high gas pressure. Resistivity measurements have been performed in fields up to 10 T. The Hg0.8Pb0.2-1234 single crystals of a size up to 0.5×0.5 mm2 have a T c onset of 130 K. Single crystals of CaCuO2 of a size up to 2×1 mm2 have a T c onset between 70 and 100 K. X-ray structural refinements have been performed on the CaCuO2 and HgPb-12(n−1)n single crystals.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: High temperature superconductors ; copper oxygen chains ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Effekt des Carbonateinbaus auf die strukturellen und supraleitenden Eigenschaften der Doppelkettenverbindung Y2Ba4Cu7O15-xStrukturelle Untersuchungen von Pulverpräparaten von Y2Ba4Cu7O15-x mit unterschiedlichem Carbonatgehalt wurden durchgeführt. Die Rietveld-Verfeinerung mit Röntgen-Pulver-Daten zeigt einen bemerkenswerten Einfluß des Carbonateinbaus auf die Gitterkonstanten. Ein auffälliger Effekt ist die Herabsetzung von Tc mit steigendem Carbonatgehalt. Wir führen diese Effekte auf einen Einbau des Carbonations in das Gitter, Fehlstellen an der Cu(1) Position und eine mögliche Fehlorientierung der einfachen Kupfer-Sauerstoffketten zurück. Eine Änderung der Struktur (z. B. Überstruktur) konnte nicht gefunden werden.
    Notes: Structural investigations on powder samples of Y2Ba4Cu7O15-x with different carbonate content have been performed. Powder x-ray Rietveld refinements showed the remarkable influence of carbonate incorporation on the lattice parameters. Most important is the decrease of Tc with increasing carbonate content. We assign these effects to an incorporation of the carbonate ion into the crystal lattice, copper vacancies at the Cu(1) position and a possible misorientation of the copper oxygen single chains. No change of the structure (e. g. superstructure) could be found.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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