Phase compatibility and preparation of composite

Abstract

The chemical compatibility of the phase with was investigated, and a composite superconductor was prepared. Ceramic processing of the corresponding oxide and carbonate mixture at led to the two-phase species , while the solubility of In in Bi-2212 was less than 5 mol%. At indium appeared to be less soluble in the BSCCO melt, instead being concentrated in fine grains of phase suspended in the liquid. By slow crystallization of the melt the 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 and resulted in increase of flux pinning at K.