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Advantages of Barium Peroxide in the Powder Synthesis of Perovskite Superconductors

Published online by Cambridge University Press:  28 February 2011

A. F. Hepp ,
J. R. Gaier ,
W. H. Philipp ,
J. D. Warner ,
R. G. Garlick ,
J. J. Pouch  and
P. D. Hambourger
A. F. Hepp
Affiliation:
NASA Lewis Research Center, Brookpark Rd., Cleveland, OH 44135
J. R. Gaier
Affiliation:
NASA Lewis Research Center, Brookpark Rd., Cleveland, OH 44135
W. H. Philipp
Affiliation:
NASA Lewis Research Center, Brookpark Rd., Cleveland, OH 44135
J. D. Warner
Affiliation:
NASA Lewis Research Center, Brookpark Rd., Cleveland, OH 44135
R. G. Garlick
Affiliation:
NASA Lewis Research Center, Brookpark Rd., Cleveland, OH 44135
J. J. Pouch
Affiliation:
NASA Lewis Research Center, Brookpark Rd., Cleveland, OH 44135
P. D. Hambourger
Affiliation:
Physics Dept., Cleveland State University, Cleveland, OH 44115
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Extract

The results of Bednorz and Muller [1] and Wu and Chu [2] have stimulated a tremendous volume of research on ceramic superconductors [3–7]. Despite a number of other synthetic techniques, the solid state reaction remains the choice of most workers due to its simplicity [4,5,7]: CuO, Y2O3 and BaCO3 are often used in the powder synthesis of Ba2YCu3O7−x. BaO2 is known to be a useful reagent in the synthesis of compounds containing higher oxidation states of metals [8]. Therefore, in our study of the possible role of Cu3+ in superconducting perovskites, we also use BaO2 in the solid state reaction. This paper compares reaction chemistry, material processing and material characterization using BaCO3or BaO2 in the solid state reaction. We obtain greater mass density, increased sample homogeneity, lower resistance, and improved reproducibility for material prepared using BaO2. We would like to point out that other groups have produced Ba2YCu3O7−x using BaO2 [4,7]; Calestani and Rizzoli have reported a one-step process for producing single crystals of Ba2YCu3O7−x using BaO2 [9].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 615
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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