Observation of carboxylic groups in the lattice of sintered Ba2YCu3O7−y high-Tc superconductors
F. Parmigiani, G. Chiarello, N. Ripamonti, H. Goretzki, U. Roll
DOI 10.1103/PhysRevB.36.7148 · Physical Review B
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Abstract
This study reports for the first time the experimental evidence that stable carboxylic groups are present in the lattice of sintered Ba2YCu3O7−y superconducting oxides. The carboxylic groups likely originated in the incomplete calcination of the BaCO3 precursor powder and they could be responsible for the oxygen over-stoichiometry observed in these materials. Further experimental investigations are required concerning in particular the sites of carboxylic groups in the Ba-Y-Cu-O lattice and their effects on the tetragonal-orthorhombic instability.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | midpoint |
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