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Study on the superconducting composite material formation in the system Bi2Sr2CaCu2O8+x/Al-containing phasesстатья
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 ноября 2013 г.
- Авторы: Kazin P.E., Poltavets V.V., Tretyakov Y.D., Jansen M., Freitag B., Mader W
- Журнал: Physica C: Superconductivity and its Applications
- Том: 280
- Номер: 4
- Год издания: 1997
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 253
- Последняя страница: 265
- DOI: 10.1016/S0921-4534(97)00299-2
- Аннотация: Phase evolution in the Bi-Sr-Ca-Cu-Al-O system was studied. Two Al-containing phases BiSr1.5Ca0.5Al2Oz and (Sr1-xCax)(3) Al2O6 (x= 0.4-0.45) were determined to be chemically compatible with Bi2.18Sr2CaCu2O8+x (Bi-2212) at temperatures of the samples processing. The phase equilibria in the title system were investigated above the solidus temperature. The BiSr1.5Ca0.5Al2Oz was found to be in equilibrium only with the melt and the (Sr1-xCax)(3)Al2O6 phase. This latter aluminate equilibrated with Ca,Sr cuprates, CaO, the Cu-free phase, and the liquid. The melting and solidification in Bi-2212, doped with the aluminate, corresponded to the reversible reaction Bi-2212 + BiSr1.5Ca0.5Al2Oz <-> (Sr1-xCax)(3)Al2O6 + liquid. Two sets of superconducting composite materials with initial compositions Bi-2212 + nBiSr(1.5)Ca(0.5)Al(2)O(z) and Bi-2212 + m(Sr1-xCax)(3)Al2O6 were prepared by solidification from the partial melt. The former material was composed mostly of large Bi-2212 lamellas separated by the BiSr1.5Ca0.5Al2Oz phase, which destroyed superconducting links between Bi-2212 grains. The latter material consisted of a Bi-2212 polycrystalline matrix with high concentration of small (ca. 3 mu m) grains of (Sr1-xCax)(3)Al2O6 imbedded in Bi-2212 lamellas. The Bi-2212+ m(Sr1-xCax)(3)Al2O6 materials displayed a trend to enhance flux pinning at T= 60 K with the increase of aluminate phase content. (C) 1997 Elsevier Science B.V.
- Добавил в систему: Казин Павел Евгеньевич