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(Y1−x)Ba2Cu3O6+δ (δ≤0.2): Consequences of Doping Tetragonal 123-Type to Induce Superconductivity

Published online by Cambridge University Press:  21 February 2011

John B. Parise ,
Pratibha L. Gai ,
M. K. Crawford  and
Eugene M. McCarron III
John B. Parise
Affiliation:
Central Research and Development Department, E. I. Du Pont de Nemours and Company, Experimental Station, P.O. Box 80356, Wilmington, DE 19880–0356
Pratibha L. Gai
Affiliation:
Central Research and Development Department, E. I. Du Pont de Nemours and Company, Experimental Station, P.O. Box 80356, Wilmington, DE 19880–0356
M. K. Crawford
Affiliation:
Central Research and Development Department, E. I. Du Pont de Nemours and Company, Experimental Station, P.O. Box 80356, Wilmington, DE 19880–0356
Eugene M. McCarron III
Affiliation:
Central Research and Development Department, E. I. Du Pont de Nemours and Company, Experimental Station, P.O. Box 80356, Wilmington, DE 19880–0356
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Abstract

Substitution of Ca(II) for Y(III) into tetragonal YBa2Cu3O6 has been achieved and a superconducting transition has been observed for a material of nominal composition (Y0.5Ca0.5) Ba2Cu3O6 (Tc (onset) ˜50K) [1]. Observations using high resolution electron microscopy show samples with x < 0.3 consist of a complex mixture, including (Y, Ca) Ba2Cu3O6+δ, YBa2Cu3O6+δ, and BaCuO2. Further, structural refinement using neutron diffraction data provide evidence of a solid solution limit at x ˜ 0.3. A direct analogy can be drawn between superconducting (Y1−xCax)Ba2Cu3O6 (0.1 < x < 0.3) and superconductors of the type (Y1−xCax)Pb2Sr2Cu3O8 and (La2−xM(II)x)CuO4. Substitution of the Ca(II) for Y(III) effectively increases the formal copper oxidation state. The refined structural model is fully consistent with partially oxidized CuO2 sheets separated by linear O-Cu(I)-O units.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 105
Copyright
Copyright © Materials Research Society 1989

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References

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