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  • 1
    Electronic Resource
    Electronic Resource
    57Fe Mössbauer study of YBa4Cu2.95Fe0.05O8.5+y (1991)
    Springer
    Applied physics 53 (1991), S. 426-429 
    Details
    ISSN: 1432-0630
    Keywords: 74.70.Vy ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 57Fe Mössbauer measurements were performed on the Fe-doped YBa4Cu3O8.5+y compound as a function of annealing temperature in vacuum. Mössbauer spectra were analyzed using three different quadrupole split doublets. The resistance measurements showed that the compound is not superconducting. The possible identification of the Cu sites with their nearest neighbor oxygen sites in this compound is suggested. Comparison of the results with data of the presence of the superconductor YBa2Cu3O7 allows us to suppose that the presence of the Cu-chain sites alone does not result in superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348157
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stable tetragonal HTSC Fe-doped 1-2-3 phase with oxygen excess (1992)
    Springer
    Applied physics 54 (1992), S. 497-499 
    Details
    ISSN: 1432-0630
    Keywords: 74.70.Vy ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Mössbauer study was performed on the YBa2Cu2.95Fe0.05O y compound prepared in three different states: orthorhombic phase with y℞7, tetragonal non-superconducting phase with oxygen deficiency, and a new tretragonal superconducting phase with oxygen excess (y〉7). The new synthesis method was used for preparation of the Fe-doped YBa2Cu3O y (named 1-2-3) compound. The comparison of Mössbauer spectra of three different states allowed us to identify the oxygen environments of the Fe atoms in the Cu1 positions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324327
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A study of the new compound YBa4Fe3O11−y (1995)
    Springer
    Applied physics 60 (1995), S. 255-259 
    Details
    ISSN: 1432-0630
    Keywords: 74.70.Vy ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The compound YBa4Fe3O y was synthesized where the Fe atoms completely substituted for the Cu atoms in YBa4Fe3O y . The X-ray phase analysis of the synthesized material showed that the diffraction pattern corresponds to the data for the compound YBa4Fe3O y .57Fe Mössbauer measurements of the compound were performed at room temperature after different heat treatments: high-temperature synthesis in an oxygen atmosphere and in air, and low-temperature annealing in oxygen and in vacuum. No magnetic components are observed after any heat treatments. The Fe atoms in the compound have two valence states, Fe3+ and Fe4+. The idealized model of the 1-4-3 Fe structure is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538400
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A study of the new compound YBa4Fe3O11− y (1995)
    Springer
    Applied physics 60 (1995), S. 255-259 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 74.70.Vy; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The compound YBa4Fe3Oy was synthesized where the Fe atoms completely substituted for the Cu atoms in YBa4Fe3Oy. The X-ray phase analysis of the synthesized material showed that the diffraction pattern corresponds to the data for the compound YBa4Fe3Oy. 57Fe Mössbauer measurements of the compound were performed at room temperature after different heat treatments: high-temperature synthesis in an oxygen atmosphere and in air, and low-temperature annealing in oxygen and in vacuum. No magnetic components are observed after any heat treatments. The Fe atoms in the compound have two valence states, Fe3+ and Fe4+. The idealized model of the 1-4-3 Fe structure is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538400
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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