Effect of the Ru content on the phase equilibria in the RuSr2GdCu2O8 synthesis

• Published in: Physica. C, Superconductivity Vol. 460-462; no. 1; pp. 401 - 402
• Main Authors: Casini, Eugenio, Papageorgiou, Thomas P., Herrmannsdörfer, T., Wosnitza, J., Braun, Hans F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-09-2007; Elsevier Science
• Subjects: Chemical-vapour-transport (CVT); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cuprates superconductors (high tc and insulating parent compounds); Exact sciences and technology; Other cuprates; Physics; Rietveld refinement; RuGd1212; Ruthenocuprates; SEM-EDX study; Superconductivity; Ruthenocuprates; Chemical-vapour-transport (CVT); Rietveld refinement; RuGd1212; SEM-EDX study; Scanning electron microscopy; Phase diagrams; Annealing; Ruthenium oxides; Controlled atmospheres; Crystal growth from vapors; Dispersive spectrometry; Gadolinium oxides; Strontium oxides; Phase equilibria; Ruthénocuprates; Copper oxides
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2007.03.099

In this study we report the synthesis and characterization of four samples prepared with a nominal RuSr2GdCu2O8 starting composition following a two-step procedure, involving the Sr2GdRuO6 compound as precursor, in a controlled atmosphere. A chemical-vapour-transport process in an open system is used to control the Ru content in these samples during the annealing cycle. We observe that high Ru-oxides mass transport results in a change of the phases in equilibrium at the RuSr2GdCu2O8 composition and a multiphase product is obtained. Rietveld refinement analysis and SEM-EDX studies are carried out in order to estimate the Ru content in the as-prepared RuGd1212.