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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Critical aspects on preparation of Bi-2223 glassy precursor by melt-process
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Critical aspects on preparation of Bi-2223 glassy precursor by melt-process

机译：熔融法制备Bi-2223玻璃态前体的关键方面

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摘要

It is well known that many Bi-Sr-Ca-Cu-O compositions are glass forming and are converted into high-critical temperature superconductors after proper annealing. Glassy precursors have been prepared by rapid quenching of nominal Bi2Sr2Ca2CU3O10 melts from above 1000 degrees C in air using different conditions. In order to fabricate superconductors having high-critical temperature and current density using the glass-ceramic route, it is necessary to clarify the total chemical composition of the quenched glasses. For the first time the total chemical composition of such melts has been directly investigated by element analysis. The oxygen content has been directly measured by carrier gas hot extraction of as-quenched melts. The investigated cation content in as-quenched nominal Bi2Sr2Ca2CU3O10 Melts presents significant deviations in composition for the glassy precursor, foremost for the calcium content. The main reasons of the non-complete transition from nominal to obtained composition after the quenching step was showed to be due to inhomogeneous and incomplete melting. This dependency is showed to be highly affected by the nominal composition of the melt. From literature there are barely any published values of the chemical composition of the quenched glassy precursors that would however be critical to control the crystallization behavior and to understand the influences on the superconductive properties. (C) 2007 Elsevier B.V. All rights reserved.
机译：众所周知，许多Bi-Sr-Ca-Cu-O组合物是玻璃形成的，经过适当的退火后会转变成高临界温度的超导体。玻璃态前驱物是通过在不同条件下，在空气中从高于1000摄氏度的温度快速淬灭标称Bi2Sr2Ca2CU3O10熔体而制备的。为了使用玻璃-陶瓷路线制造具有高临界温度和电流密度的超导体，有必要弄清淬火玻璃的总化学组成。首次通过元素分析直接研究了这种熔体的总化学组成。氧含量已通过载气对骤冷熔体的热萃取直接测量。淬火的标称Bi2Sr2Ca2CU3O10熔体中的阳离子含量研究表明，玻璃状前体的组成存在明显偏差，其中钙含量最为明显。淬火步骤后，从标称成分到获得的成分不完全过渡的主要原因表明是由于熔融不均匀和不完全。事实证明，这种依赖性受熔体标称成分的影响很大。从文献中几乎没有公开的淬火玻璃状前体的化学组成的任何值，但是这些值对于控制结晶行为和理解对超导性能的影响至关重要。 （C）2007 Elsevier B.V.保留所有权利。

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