Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10653261 | Solid State Communications | 2005 | 6 Pages |
Abstract
Comprehensive studies of X-ray diffraction, oxygen content, superconductivity and Mössbauer effect have been made on FexCu1âxBa2YCu2O7+y superconductors (0.00â¤xâ¤0.70) synthesized by ambient (AM) and high pressure (HP). Results indicate that all the HP-samples have tetragonal structure, smaller lattice parameter c and unit-cell volume than the AM-samples. The studies of oxygen content, and Mössbauer spectroscopy indicate that the HP-samples have higher oxygen content, carrier concentration and average valence of Fe than the AM-samples. Moreover, for the HP-samples more Fe atoms located in CuOx chains have fivefold-oxygen coordination. These are important reasons for the enhancement of Tc in the HP-samples.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Y.H. Liu, G.C. Che, K.Q. Li, Z.X. Zhao, Z.Q. Kou, N.L. Di, Z.H. Cheng,