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• W1976590219 abstract "Abstract Five samples of the HgBa 2 Sm 1− x Ca x Cu 2 O 6+δ phase were prepared. They were synthesized with different compositions, by reacting metal oxides in closed silica ampoules at 720°C for 40 h. The phase is isostructural with the tetragonal 127 K superconductor HgBa 2 CaCu 2 O 6+δ . The samples were investigated by electron microscopy, EDS analysis and X-ray powder diffraction. Electron diffraction revealed no superstructure or modulation. Rietveld structure refinements of two samples, with x = 0 and 0.5, indicated that the Hg sites were only partly occupied by mercury. A surplus of copper and samarium found in the analysis suggests that they partly substitute for mercury at this site. The refinements showed that the phase with x = 0.5 had less puckered CuO planes than HgBa 2 SmCu 2 O 6+δ . The latter showed no superconducting transition down to 15 K, and its unit-cell dimensions were not changed by oxygen or nitrogen treatments at 300°C. The Ca containing phase, HgBa 2 Sm 0.5 Ca 0.5 Cu 2 O 6+δ , had a broad superconducting transition with T c onset = 115 K. The low superconducting volume indicates that the diamagnetic signal stems from more calcium-rich crystallites." @default.
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• W1976590219 date "1995-06-01" @default.
• W1976590219 modified "2023-09-29" @default.
• W1976590219 title "Synthesis and structure investigation of Sm containing Hg-1212 phases" @default.
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• W1976590219 doi "https://doi.org/10.1016/0921-4534(95)00221-9" @default.
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