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  • electrical properties  (1)
  • magnetization  (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
    Synthesis, Structure, and Superconductivity of (La1.5Pb0.5−xSrx)CuOz (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 121-128 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; crystal structure ; magnetization ; 214
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The substitution of strontium for lead in the material (La1.5Pb0.5−x Sr x )CuO z , x = 0–0.15 has been carried out. A stable and reproducible single phased superconducting materials can be obtained inside an evacuated quartz tube. The X-ray diffraction pattern shows that the superconducting phase can be indexed on the basis of an orthorhombic symmetry (F mmm) for x = 0 and on the basis of tetragonal symmetry (I 4/mmm) for x 〉 0. The transition temperature T c increases as the strontium substitution parameter x increases. We observed the maximal T c around x = 0.15 with 38 K with fairly large Meissner volume fraction of 38% (FC).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007790512982
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