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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/2CF90862-E6E5-461E-8FF8-F2F4CF861D07 | ||
| Year | 1995 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | T. Leventouri, G. A. Soifer, M. Calamiotou, V. Perdikatsis, and E. Liarokapis, "Ca doped YBCO on the Ba site", J. Superconduct., vol. 8, no. 5, pp. 625-626, Oct. 1995. doi:10.1007/BF00727448 https://doi.org/10.1007/BF00727448 | ||
| Appears in Collections |
The effect of partial, nominal replacement of Ba with Ca on the properties of the YBa2Cu3O6+gd superconductor varies with the concentration of Ca. For nominal concentrations in Ca up to 50% a two phase system is formed: the known superconducting phase Y1−yCayBa2Cu3O6+δ and a new, non superconducting phase of composition Y1.14Ca1.58Cu3.27O6.45. The x-ray diffraction pattern of this new phase matches the Bragg peaks, as well as the commensurate and incommensurate peaks of a partially indexed pattern of the phase Y2−xCa2+xCu5O10. For nominal Ca concentrations 40 and 50%, microprobe analysis shows that the superconducting phase becomes a mixture of Y1−yCayBa2Cu3O6+° and YBa1.8Ca0.2Cu3O6.5, where Ca enters the structure in the Ba site. The microraman spectra indicate a small substitution of Ba by Ca, while the new phase shows novel characteristics.
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