Phase diagram of BinSrCaCu3−nOy on the line 1≤n≤2

Abstract

The pseudobinary phase diagram of BinSrCaCu3−nOy was determined on the line 1≤n≤2 upon which the low Tc superconductor phase [Bi2(Sr,Ca)3Cu2Oy] and the semiconductor phase [Bi2(Sr,Ca)2CuOy] are located. The liquidus line of the superconductor phase was found to lie in the region 1.6≤n≤1.875. A small quantity of transparent crystal was found even in the melting phase, which suggests that samples with these compositions do not melt homogeneously. Therefore, single crystals or single-phase superconductor materials apparently can be grown from the liquid phase by obtaining a homogeneous melt in this region.

Phase diagrams, melt solidification and glass crystallization in the Bi-Ca-Sr-Cu-(O) system

“…The most intensive studies have been devoted to the already classical system Y-Ba-Cu-O, as reviewed in [21- 28], which can be best analysed in terms of a partially open system Y-Ba-Cu-(O) [28]. Known binary edges [29][30][31][32][33][34] are eoUeetively shown in Figs 1 and 2 and complemented by the only known pseudobinary cut [35]. Known binary edges [29][30][31][32][33][34] are eoUeetively shown in Figs 1 and 2 and complemented by the only known pseudobinary cut [35].…”

“…1 The binary edges of CaO-BizO3, CaO-CuO, StO-Bi203 and SrO-CuO including the glassforming region (dashed-and-dotted), isostructural joins (dotted) and major superconductive compositions BizSrCal~CtgO, [29][30][31][32][33][34] z Thavnat Anat, 34 looo ~ESTfid(: PHASE DIAGRAMS (Ca7Sr7). The only pseudobinary cut was reported on the line l<n < 2 of the system Bin(SrCa)Cu3-nOx [35], locating the HTS phase 2(3)2 (i.e. This can be regarded as the end-member of the homologous series (TI, Bi)2(Ba,Sr)2Can-lCunO4-2n, in which all the T1 and Bi layers have been removed, leaving only Cu-O layers alternating with those of (Sr, Ca)-O.…”

“…The binary system of Bi203, CaO and CuO end members covering the only known pseudobinary cut[35] BiySrCa-Cu3.yOx (1 < y < 2) and the subsolidus region (at about 900~ of the ternary diagram[34] (top corner corresponding the composition 40 CUO-25 SRO-35 BIO3/2) around the two important phases Bi2Sr2CuO6 (221) and Raveau-type solid-solution (/~).…”

Spatial Distribution of Trapped Magnetic Flux in the High-Tc Superconductor Y1Ba2Cu3O7-δ. II. Comparison with the Critical State Model

“…As a starting material, we prepared calcined powder of the nominal composition Bi 2.6 Sr 2 CaCu 2 O x . The addition of the extra bismuth oxide was to avoid the formation of Sr-Ca-Cu-O compounds at high temperatures [12,13]. This is near the solvent composition in the TSFZ method [12,14].…”