ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 74.70.Vy  (2)
  • Springer  (2)
  • American Chemical Society
  • Oxford University Press
  • Wiley
  • 1
    Electronic Resource
    Electronic Resource
    X-ray diffraction analysis of the modulated structure of Bi2Sr2CaFe2O y (1996)
    Springer
    Applied physics 62 (1996), S. 275-279 
    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 modulated structure of the Bi2Sr2CaFe2O y compound isomorphous with the Bi2Sr2CaCu2O y phase was refined by the method of the full profile analysis on the basis of the powder X-ray diffraction data. The analysis was carried out in the superspace group ofN:Abmm: 1 – 11 using the parameters of the unit cell of the basic structurea = 5.466(3),b = 5.446(5) andc = 31.25(9) Å and the modulation vectorq = 0.220(5)b* +c*. The model of excess oxygen interstitials into the BiO plane was used by applying a saw-tooth-type function of the form:U = 2U 0 [(X 4 -X 4 0 /Δ)] [1]. The results point to a strong displacement of the atoms from their positions in the basic structure. An essential improvement of theR factors was obtained by taking into account the modulation waves of the higher harmonics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575094
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Study of the modulated structure of Bi2Sr2CaFe2Ox (1995)
    Springer
    Applied physics 60 (1995), S. 71-75 
    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 ceramics and single crystals of the Bi2Sr2CaFe2Ox compound were synthesized. The X-ray diffraction data showed orthorhombic symmetry. The lattice parameters are equal toa=5.464 Å,b=5.453 Å,c=31.313 Å. The crystal structure is described by the primitive Bravais lattice with the possible space groups Pbmm. Pbm2 and Pb21m. The obtained X-ray patterns show the presence the incommensurate structural modulation with the following parameters: the modulation vector lies in the (100)-plane, the value of the wave-vector componentq b=0.22(3). The comparison of the obtained results with data for Fe-doped Bi2Sr2CaCu2Ox and Bi2Sr3Fe2Ox are presented. No magnetic peculiarities of the compound were found. Mőssbauer measurements of the ceramic samples indicate the presence mainly of Fe3+ oxidation state and Fe4+ (about 20%). The decrease of the quadrupole-splitting values for 2212Fe in comparison with Fe-doped 2212Cu was revealed that may be connected with higher symmetry of the local environment of Fe atoms in 2212Fe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01577616
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...