Morris, D. E. ; Marathe, A. P. ; Sinha, A. P. B. (1990) Destabilisation of 124 and 247 phases of Y-Ba-Cu-O by Fe substitution at elevated oxygen pressures Physica C: Superconductivity, 169 (5-6). pp. 386-390. ISSN 0921-4534
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Official URL: http://www.sciencedirect.com/science/article/pii/0...
Related URL: http://dx.doi.org/10.1016/0921-4534(90)90581-X
Abstract
Single phase iron-substituted 124, (YBa2Cu4-xFexOy) has been obtained in the range of 0≤ x≤ 0.05 at oxygen pressure of 200 bar and 100 bar. Greater Fe substitution at elevated P(O2) destabilised the 124 and 247 phases in favor of a tetragonal 123 phase (FeT-123). The solubility of Fe in FeT-123 phase increases with oxygen pressure. The lattice parameters do not change significantly with Fe content and P(O2). The formal average cooper valency (FACV) of single phase FeT-123 samples is high (e.g. FACV=2.58 for x=0.65). The reduction of Tc caused by Fe substitution in YBa2Cu3-xFexOy is about 6 K/%x over the range (0≤ x≤ 0.2) for samples prepared at P(O2)=200 bar and cooled slowly under pressure.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 48926 |
| Deposited On: | 18 Jul 2011 10:14 |
| Last Modified: | 18 Jul 2011 10:14 |
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