During the attempts to improve sealed-quartz tube synthesis of Hg(Re)-1223 superconductor, a new compound was systematically identified in certain unsuccessful experimental conditions. It was characterized by a well distinct powder diffraction pattern with cubic diamond-like extinctions and lattice parameter 8.48-8.53 A. The composition was determined as EfeReo.sBa^ai.sOs.s and an univocal interpretation was found in terms of the high-symmetry space group Fm3m(225), with Z=2, (=6.70 g/cm3 ; the reliability factor was 5.0%. This phase, Cu-free and not superconductive, rather than a precursor can be considered as an unwanted accident in Hg(Re)-1223 preparation route. Its existence was confirmed by a successful synthesis starting from the above reported stoichiometry
(2000). Crystal structure data on a new cubic phase acting as antagonist in the synthesis of Hg(Re)-1223 superconductor . In INTERNATIONAL JOURNAL OF MODERN PHYSICS B. Retrieved from https://hdl.handle.net/10446/274032
Crystal structure data on a new cubic phase acting as antagonist in the synthesis of Hg(Re)-1223 superconductor
Cavallaro, Andrea
2000-01-01
Abstract
During the attempts to improve sealed-quartz tube synthesis of Hg(Re)-1223 superconductor, a new compound was systematically identified in certain unsuccessful experimental conditions. It was characterized by a well distinct powder diffraction pattern with cubic diamond-like extinctions and lattice parameter 8.48-8.53 A. The composition was determined as EfeReo.sBa^ai.sOs.s and an univocal interpretation was found in terms of the high-symmetry space group Fm3m(225), with Z=2, (=6.70 g/cm3 ; the reliability factor was 5.0%. This phase, Cu-free and not superconductive, rather than a precursor can be considered as an unwanted accident in Hg(Re)-1223 preparation route. Its existence was confirmed by a successful synthesis starting from the above reported stoichiometryFile | Dimensione del file | Formato | |
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CRYSTAL STRUCTURE DATA ON A NEW CUBIC PHASE ACTING AS ANTAGONIST IN THE SYNTHESIS OF Hg(Re)-1223 SUPERCONDUCTOR.pdf
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