Articles
  • Preparation of polycrystalline samples of solid solutions Sm1+xBa2-xCu3O6+y (x = 0.0-0.7) and a study of their structural and superconducting properties
  • M.Yu. Kameneva*, L.P. Kozeeva, A.G. Blinov, N.V. Kuratieva and V.E. Fedorov
  • Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 3, Akad. Lavrentiev Prospect, 630090, Novosibirsk, Russia
Abstract
Single-phase polycrystalline samples of Sm1Ba2Cu3O6+y (123 SmSS) with x = 0.0-0.7 were prepared in air by solid state synthesis with precisely controlled technological parameters (the heating and cooling rates, temperature-time regime). Microstructural, structural, and superconducting properties were studied. It is shown that cation stoichiometric samples of Sm1Ba2Cu3O6+y with a high temperature superconducting transition (89-92K) can be obtained in air. By increasing the Sm/Ba ratio in Sm1+xBa2-xCu3O6+y the orthorhombic-to-tetragonal phase transition is observed. The orthorhombic phase loses its stability at x > 0.125, and the solid solution decomposes by a spinodal mechanism to form layered microstructures with a variable Sm/ Ba ratio. The data obtained are useful for understanding the mechanisms of the formation of possible vortex pinning centers in Ln1+xBa2-xCu3O6+y phases.

Keywords: A. inorganic compounds, B. chemical synthesis, C. electron microscopy, C. X-ray diffraction, D. superconductivity.

This Article

  • 2009; 10(1): 61-65

    Published on Feb 28, 2009