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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/25276

    Title: Superconductivity, hole concentration and peritectic transition of La1.5CaxBa1.5−xCu3Oy compounds
    Other Titles: La1.5CaxBa1.5-xCu3Oy化合物的超導性,電洞濃度與色晶轉變
    Authors: Huang, W. N.;Wang, C. M.;Kao, H.-C. I.
    Contributors: 淡江大學化學學系
    Keywords: Experimental study;Superconductivity;Carrier density;Holes;Peritectic transformation;Chemical composition;Transition temperature;Lanthanum oxides;Calcium oxides;Barium oxides;Copper oxides;Multi-element compounds;High-Tc superconductors;Stoichiometry;Inorganic compounds;Transition element compounds;Rare earth compounds
    Date: 1997-08
    Issue Date: 2013-07-09 15:26:16 (UTC+8)
    Publisher: Amsterdam: Elsevier BV * North-Holland
    Abstract: A series of single phase La1.5CaxBa1.5−xCu3Oy(0≤x≤0.50) compounds with tetragonal triple-perovskite structure is prepared. They have an incongruent melting point at 1107±1 °C which is not dependent on the amount of Ca substitution. Oxygen stoichiometry and hole concentration of these materials increase with increasing x. Thermal stability of the oxygen atom in the La1.5CaxBa1.5−xCu3Oy series is independent on the oxygen stoichiometry. For x≥ 0.25, Tc increases rapidly from 33 K to 73 K with increasing x. Tc of La1.5CaxBa1.5−xCu3Oy (CB) is always lower than that of La1.5−xCaxBa1.5Cu3Oy (LC) for a given x, suggesting that an increase in the mole fraction of the trivalent cation in these compounds would decrease its Tc.
    Relation: Physica C: Superconductivity and its Applications 282-287(2), pp.767-768
    DOI: 10.1016/S0921-4534(97)00401-2
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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