淡江大學機構典藏:Item 987654321/25188
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    Title: Rietveld analysis on Gd(Ba2−xAx)Cu3Oy (A = Ca, Sr) superconductors
    Authors: Kao, H.-C. I.;Chin, C. H.;Huang, R. C.;Wang, C. M.
    Contributors: 淡江大學化學學系
    Keywords: Calcination;Calcium;Composition;Oxygen;Perovskite;Sintering;Solubility;Strontium;Substitution reactions;Superconducting transition temperature;Superconductivity;X ray diffraction analysis;Conventional solid state reaction;Orthorhombicity;Partial substitution;Rietveld analysis;Oxide superconductors
    Date: 2000-11
    Issue Date: 2013-07-09 15:27:48 (UTC+8)
    Publisher: Amsterdam: Elsevier BV * North-Holland
    Abstract: Two series of single phase triple-perovskite superconducting samples with nominal compositions of Gd(Ba2−xCax)Cu3Oy (Ca series, 0 ≤ x ≤ 0.30) and Gd(Ba2−xSrx)Cu3Oy (Sr series, 0 ≤ x′ ≤ 1.0) were prepared. Orthorhombicity decreases with increasing amount of Ca or Sr substitution. Part of Ca ions occupy R site and push the same amount of Gd3+ ion into Ba site, attracting negative oxygen ions to randomly occupy O(4) and O(5) sites on the basal plane which leads to a further reduction of orthorhombicity in Gd(Ba2−xCax)Cu3Oy series compared with the same amount of substitution in Sr series, in which, Sr only occupies the Ba site. Tc is dependent on the orthorhombicity of these samples, no matter wheater it is Ca or Sr substitution.
    Relation: Physica C: Superconductivity and its Applications 341-348(PART 1), pp.623-624
    DOI: 10.1016/S0921-4534(00)00619-5
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

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