Phase compatibility and preparation of Bi-2212-Sr1-x CaxIn2O4 compositeстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The chemical compatibility of the Sr1-xCaxIn2O4 phase with Bi2Sr2CaCu2O8+x was investigated, and a Bi-2212-Sr1-xCaxIn2O4 composite superconductor was prepared. Ceramic processing of the corresponding oxide and carbonate mixture at. 860 degrees C led to the two-phase species Sr0.55Ca3.45In2O4 + Bi-2212, while the solubility of In in Bi-2212 was less than 5 mol%. At 900 degrees C indium appeared to be less soluble in the BSCCO melt, instead being concentrated in fine grains of Sr1-xCaxIn2O4 phase suspended in the liquid. By slow crystallization of the melt the Bi-2212-Sr1-xCaxIn2O4 composite was obtained. The In-rich phase formed micron-sized rods which were both randomly embedded in Bi-2212 lamellas and agglomerated on the Bi-2212 grain boundaries. The presence of the indium-based surplus did not prevent Bi-2212 phase formation, had minor effect on T-c and resulted in increase of flux pinning at T greater than or equal to 30 K.