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  • 8-8-20  (1)
  • Hg-1212 (Hg,Mo)Sr2(Ca,R)Cu2O z  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    High Pressure Synthesis of (La1−xSrx)8O20, (0.25 ≤ x ≤ 0.65) with a Wide Solubility Range and High Cu-Valence (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 503-511 
    Details
    ISSN: 1572-9605
    Keywords: layered compounds ; 8-8-20 ; x-ray diffraction ; electrical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract With an attempt to increase the Cu valence, we synthesized the (La1−x Sr x )8Cu8O20−δ (8-8-20 phase) compounds with large x using an O2-HIP apparatus. By heat treatment in a high-pressure of oxygen gas (40 MPa), the 8-8-20 compounds were stabilized in the range of 0.25 ≤ x ≤ 0.65. Their crystal structures, characterized by x-ray Rietveld refinement and electron diffraction, are tetragonal, space group P4/mbm. The formal copper valence was found to increase with Sr concentration from 2.24 at x = 0.25 to 2.63 at x = 0.65, keeping the oxygen content constant around 20.0. Electrical resistivity and magnetic susceptibility showed only metallic behavior from room temperature down to 5 K with no sign of superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007731915362
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  • 2
    Electronic Resource
    Electronic Resource
    Oxygen Configuration in the Superconductor (Hg0.7Mo0.3)Sr2(Ca1−xRx)Cu2Oz (R = Nd and Pr) (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 111-119 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; Hg-based cuprate ; Hg-1212 (Hg,Mo)Sr2(Ca,R)Cu2O z ; neutron diffraction ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Two series of Hg-based oxides (Hg0.7Mo0.3)Sr2(Ca1−x R x )Cu2O z (R = Nd and Pr, 0.2 ≤ x ≤ 0.7) have been synthesized. Electrical-resistivity measurements show that these compounds are superconductors with maximum onset T c of 107 and 102 K for Nd- and Pr-containing samples, respectively. The neutron powder diffraction experiments on both as-prepared and O2-annealed samples of R = Nd revealed that the O(3) site at the HgOδ sheets are fully occupied and shifted towards the Hg/Mo site to form Mo–O bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007738528912
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