Formation of Bi-2212 phase and phase assemblage in Ga-doped BSCCO systemстатья
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Аннотация:Phase relations in the Bi-Sr-Ca-Cu-Ga-O system were investigated at 850 degrees-900 degrees C. Two Ga-containing phases were found to be compatible with Bi-2212. Compositions of these phases were estimated as Bi(0.2)SF(1.8-x)Ca(x)Ga(2)O(z) and Bi(1.7)Sr(2.3)Ca(0.6)Cu(1.6)Ga(0.4)O(z). The Ga content in Bi-2212 was limited to 15-25 mol%. The mixture of Bi-2212 with the Ga-containing phases started to melt around 870 degrees C, and at 890 degrees C yields liquid and (Sr, Ca)(3)Ga(2)O(6) phase. The superconducting composites Bi-2212/Bi(0.2)Sr(1.8-x)Ca(x)Ga(2)O(z) were prepared using partial melting procedure. The dopant had only a slight effect on T(c), the flux pinning in the material was not improved at all. (C) 1999 Elsevier Science B.V. All rights reserved.