SYNTHESIS OF BIBASED HIGH-TEMPERATURE SUPERCONDUCTORS USING MELT TECHNOLOGIESстатья
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Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
Аннотация:To obtain high J(c) Bi-based superconducting materials melt-texture techniques were applied. Amorphous precursors were prepared by rapid quenching (cooling rate about 10(3)-degrees-C/s) of melted powders. Chemical composition and preparing routes of the starting mixtures were varied. The precursor with starting composition Pb0.2Bi1.8Ca1Sr2Cu2O8 was chosen among others for further investigations because of a maximal content of amorphous phase in it. The sample was crystallized by zone melting and gradient treatment. The dependence of texture extent on sample feeding was stated. The transition from isometric to directional crystallization at the cooling rate about 10-degrees-C/min was found. The samples demonstrated J(c) values about 6.10(4) A/cm2 (4.2 K, H = 0 T). Some amorphous impurities on grain boundaries were found by TEM in these samples. One can assume that high J(c) values were reached due to a good grain alignment but not to a grain boundary purification.