Ca doped YBCO on the Ba site

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Superconductivity

DOI:https://doi.org/10.1007/BF00727448· OSTI ID:207195

Leventouri, T; Soifer, G A ^[1]; Calamiotou, M ^[2]

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1. Florida Atlantic Univ., Boca Raton, FL (United States)
2. Univ. of Athens (Greece); and others

The effect of partial, nominal replacement of Ba with Ca on the properties of the YBa{sub 2}Cu{sub 3}O{sub 6+{delta}} 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 Y{sub 1{minus}y}Ca{sub y}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}} and a new, non superconducting phase of composition Y{sub 1.14}Ca{sub 1.58}Cu{sub 3.27}O{sub 6.45}. 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 Y{sub 2{minus}x}Ca{sub 2+x}Cu{sub 5}O{sub 10}. For nominal Ca concentrations 40 and 50%, microprobe analysis shows that the superconducting phase becomes a mixture of Y{sub 1{minus}y}Ca{sub y}Ba{sub 2}Cu{sub 3}O{sub 6+{delta}} and YBa{sub 1.8}Ca{sub 0.2}Cu{sub 3}O{sub 6.5}, 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.

• Sponsoring Organization: USDOE
• OSTI ID: 207195
• Journal Information: Journal of Superconductivity, Journal Name: Journal of Superconductivity Journal Issue: 5 Vol. 8; ISSN JOUSEH; ISSN 0896-1107
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM ADDITIONS
COPPER OXIDES
DOPED MATERIALS
PHASE STUDIES
YTTRIUM OXIDES