Structure of the high-Tc superconductor Ba2YCu3Ox at 750 °C using neutron diffraction
Q. W. Yan, P. L. Zhang, Z. G. Shen, J. K. Zhao, Y. Ren, Y. N. Wei, C. X. Liu, T. S. Ning, K. Sun, S. W. Niu
DOI 10.1103/PhysRevB.37.5845 · Physical Review B
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Abstract
The crystal structure of the high-Tc superconductor Ba2YCu3Ox at 750 °C was elucidated using Rietveld analysis of neutron powder diffraction data. We find that the phase is tetragonal at this temperature, with space group P4/mmm, and lattice constants a=3.8823 Å and c=11.826 Å. This is an oxygen deficient triperovskite, in which Ba and Y ions are ordered along the c axes in Ba-Y-Ba-Ba sequence. The occupation factors of the oxygen sites 4i, 2g, 2f are 0.97, 1.00, 0.33, respectively. The total number of the oxygen atoms per unit cell is 6.54.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | unknown |
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