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High Temperature Stability of Superconducting YBa2 Cu30x as Characterized by X-Ray Diffraction

Published online by Cambridge University Press:  06 March 2019

M. O. Eatough ,
T. L. Aselage ,
K. D. Keefer ,
D. S. Ginley  and
B. Morosin
M. O. Eatough
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185
T. L. Aselage
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185
K. D. Keefer
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185
D. S. Ginley
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185
B. Morosin
Affiliation:
Sandia National Laboratories Albuquerque, NM 87185
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Extract

The recent discovery of superconducting oxide ceramics with critical temperatures (Tc) near 100°K has stimulated research at an unprecedented pace. Single phase YBa2 Cu30x (x = 6.9), the subject of most of the interest, is an oxygen deficient 1:1:3 stacked perovskite derivative, (The structure of this materials has been described by a number of authors, many of whom are referenced by Jorgensen et al.) At room temperture it has an orthorhombic structure with lattice parameters near: a = 3.82Å, b = 3.88Å, and c - 11.68 Å. At lower oxygen values (x≤6.5) the structure is tetragonal with lattice parameters near: a = 3.86 and c = 11.80. It has been suggested that tetragonal YBa2 Cu30x is not superconducting. YBa2 Cu30x, regardless of oxygen content, is referred to here as 123.

Type
V. X-Ray and Neutron Diffraction Applications Including Superconductors
Information
Advances in X-Ray Analysis , Volume 31: Thirty-Sixth Annual Conference on Applications of X-ray Analysis, August 3-7, 1987 , 1987 , pp. 351 - 357
Copyright
Copyright © International Centre for Diffraction Data 1987

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References

1. Jorgensen, J.D., Beno, M.A., Hinks, D.G., Soderholm, L., Volin, K.J., Hitterman, R.L., Grace, J.D., Schuller, I.K., Segre, C. U., Zhang, K., and Kleefisch, M.S., Oxygen Ordering and the Orthorhombic-to- Tetragonal Phase Transition in YBa2Cu-07 , submitted Phys. Rev. (6/87) (and references therein).Google Scholar
2. Gallagher, P.K., Brian, H.M.O., Sunshine, S.A., and Murphy, D.W., Oxygen Stoichiometry in Ba2YCu.jOx , Mat. Res. Bull. 22: 995 (1987).Google Scholar
3. Powder Diffraction, vol. 2, no, 2: 116 (1987).Google Scholar
4. Eatough, M.O., Ginley, D.S., Morosin, B., and Venturlni, E.L., Orthorhombic-Tetragonal Phase Transition in High Temperature Superconductor YBa2Cu3O7, Appl. Phys. Lett. 51: 367 (1987).Google Scholar