Variation of composition in a Bi(Pb)-Sr-Ca-Cu-O grain and the influence of Mg and Ba doping on its superconductivity

The 110 K phase (2223) and (Sr, Ca)-Cu-O phase exist in the Bi(Pb)-Sr-Ca-Cu-O ceramics. The Cu content varies in the perpendicular direction of platelike 2223 grains, but little variation is observed on the planer surface of the grains along their length. Only the 110 K phase was found in the X-ray...

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Published inJapanese Journal of Applied Physics Vol. 28; no. 7; pp. L1140 - L1143
Main Authors ASHIZAWA, T, SHIMODA, S, YAMANA, S, SUMIYA, K, ISHIHARA, M, KUWAJIMA, H
Format Journal Article
LanguageEnglish
Published Tokyo Japanese journal of applied physics 01.07.1989
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
Scanning electron microscopy
Stoichiometry
Barium
Electrical conductivity
Grains
Impurity
Bismuth Calcium Copper Lead Strontium Oxides Mixed
Transition metal Compounds
Experimental study
X ray diffraction
Inorganic compound
Magnetic susceptibility
Sintering
Preparation
Magnesium
Microstructure
High temperature superconductor
Superconducting transition
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Summary:The 110 K phase (2223) and (Sr, Ca)-Cu-O phase exist in the Bi(Pb)-Sr-Ca-Cu-O ceramics. The Cu content varies in the perpendicular direction of platelike 2223 grains, but little variation is observed on the planer surface of the grains along their length. Only the 110 K phase was found in the X-ray diffraction pattern of Bi(Pb)-Sr(Ba, Mg)-Ca-Cu-O. Its electrical resistivity became zero at 110 K. By the partial substitution of Mg and Ba for Sr, the range of sintering temperatures in which we obtained a higher T c zero was much larger than that for Bi(Pb)-Sr-Ca-Cu-O.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.28.l1140