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      저자 : M.Yu. Kameneva (검색결과 2 건)
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        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,V.E. Fedorov 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1

        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. 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.

      • Preparation and characterization of HTSC LuBa2Cu3O6+x single crystals

        V.E.Fedorov,M.Yu.Kameneva,N.V.Podberezskaya,D.Yu.Naumov,N.F.Beizel,U-HyonPaeka,L.P.Kozeeva 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3

        For the first time large HTSC (high temperature superconductive) crystals of LuBa2Cu3O6+x (up to 5´5´0.2 mm3) were obtained from the Lu2O3-BaO-CuO system by a flux growth method. The crystals obtained were characterized by differential thermal analysis (DTA), chemical and X-ray diffraction analyses. The temperature of incongruent melting of the phase was defined more exactly (950±5oC). The composition of crystals corresponds to the formula LuBa2Cu3O6+x. The crystal structure of the tetragonal form was determined and x=0 was found for this case.

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