Abstract
The oxygen-deficient orthorhombic oxide YBa2Cu3O7–δ1–3 has been the centre of intense recent interest because of its bulk superconducting properties near 90 K. More recently the closely related oxide, La1.5Ba1.5Cu3O7+δ, is receiving increased attention4–7. The yttrium analogue, Y1.5Ba1.5Cu3O7+δ, has not been successfully synthesized by the usual ceramic routes involving firing at temperatures above 900°C8,9, because of its intrinsic metastability. Here we report on the synthesis and characterization of a majority (90–95%) phase Y1.5Ba1.5Cu3O7+δ(referred to for historical reasons8 as Y 3-3-6), prepared by firing an atomically mixed citrate precursor between 810° and 825 °C for 2 h. X-ray powder diffraction data indicate that Y 3-3-6 is isostructural with its tetragonal La analogue4,7. Electron microprobe and thermogravimetry data yield a unit-cell composition Y(Ba2–xYx)Cu3O7+δ, with x=0.50 and δ=0.1–0.15 for the parent compound. Specimens of Y 3-3-6 with x = 0.50 and 0.375, which were annealed in O2 at 1 atm and >3 atm, displayed semiconducting behaviour. Filamentary superconductivity, detected electrically and magnetically, with transition onsets at 80 and 60 K respectively, is observed in specimens annealed in 3 atm O2 at 520°C.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Wu, M. K. et al. Phys. Rev. Lett. 58, 907–911 (1987).
David, W. I. F. et al. Nature 327, 310–312 (1987).
Siegrist, T., Sunshine, S., Murphy, D. W., Cava, R. J. & Zahurak, S. M. Phys. Rev. B35, 7137–7140 (1987).
David, W. I. F. et al. Nature 328, 328–329 (1987).
Torardi, C. C. et al. Mater. Res. Bull., (in the press).
Maeda, A. et al. Jap. J. appl. Phys. 26, L1366–L1368 (1987).
Segre, C. U. et al. Nature 329, 227–229 (1987).
Er-Rakho, L., Michel, C., Provost, J. & Raveau, B. Solid St. Chem. 37, 151–156 (1981).
Rao, C. N. R., Ganguly, P., Raychandhuri, A. K., Mohan Ram, R. A. & Sreedhar, K. Nature 326, 856–857 (1987).
Santoro, A. et al. Mater. Res. Bull. 22, 1007–1013 (1987).
Grant, P. M. et al. Phys. Rev. Lett. 58, 2482–2485 (1987).
Kang, W. et al. J. Phys. Paris 48, 1181–1186 (1987).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Iqbal, Z., Reidinger, F., Bose, A. et al. Synthesis, structure and superconducting properties of metastable Y(Ba2−xYx)Cu3O7+δ. Nature 331, 326–328 (1988). https://doi.org/10.1038/331326a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/331326a0
This article is cited by
-
Phase diagrams for the YBa2Cu3O7 family — ANNO 1996
Journal of Thermal Analysis (1997)
-
Shock wave synthesis and processing of high temperature superconductors with defect microstructures
Bulletin of Materials Science (1991)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.