Formation of Bi(Pb)-2223 with chemically compatible V-rich phaseстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 9 ноября 2013 г.

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[1] Formation of bi(pb)-2223 with chemically compatible v-rich phase / P. E. Kazin, M. A. Uskova, Y. D. Tretyakov et al. // Physica C: Superconductivity and its Applications. — 1998. — Vol. 301, no. 3-4. — P. 185–191. Phase assemblage was studied in the samples obtained by thermal treatment of fine nitrate mixtures containing cations of Pi, Pb, Sr, Ca, Cu, and V. Large Bi(Pb)-2223 phase fraction was observed for the initial composition Bi(Pb)-2223 + Sr3V2O8. It was found that vanadium-containing surplus resulted in the formation of Sr3-xCaxCuyV2Oz phase which proved to be chemically compatible with Bi(Pb)-2223, while vanadium solubility in the Bi(Pb)-2223 did not exceed 5 mol%. The new vanadate phase had diffraction pattern different from rhombohedric Sr3V2O8. Composites of Bi(Pb)-2223 + nSr(2.8)Ca(0.2)Cu(0.3)V(2)O(z) (n = 0, 0.1, 0.5, 1) were prepared by thermal treatment of the homogeneous precursors at 860 degrees C. In the samples with large vanadium content the formation rate of Bi(Pb)-2223 phase was higher, although the presence of vanadium caused a few degrees T-c drop. Low fraction of the vanadate phase in the composite did not influence markedly the sample magnetization at 5, 30 and 77 K, while high fraction of this phase resulted in strong decrease of the hysteresis magnetization at T greater than or equal to 30 K. (C) 1998 Published by Elsevier Science B.V. All rights reserved. [ DOI ]

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