Synthesis and structure investigation of Sm containing Hg-1212 phases

N. R. Khasanova, I. Bryntse, E. V. Antipov

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10 Citations (Scopus)

Abstract

Five samples of the HgBa2Sm1-xCaxCu2O6+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 HgBa2CaCu2O6+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 CuO planes than HgBa2SmCu2O6+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, HgBa2Sm0.5Ca0.5Cu2O6+δ, had a broad superconducting transition with Tc onset = 115 K. The low superconducting volume indicates that the diamagnetic signal stems from more calcium-rich crystallites.

Original languageEnglish
Pages (from-to)197-205
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume247
Issue number3-4
DOIs
Publication statusPublished - 1 Jun 1995
Externally publishedYes

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