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首页> 外文期刊>Physica, C. Superconductivity and its applications >Observation of the formation and growth of secondary phases in Bi-2223/Ag tapes
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Observation of the formation and growth of secondary phases in Bi-2223/Ag tapes

机译：Bi-2223 / Ag胶带中次生相的形成和生长的观察

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Formation and growth of secondary phases in Bi-2223/Ag tapes have been investigated. Samples were heat treated at several temperatures for different periods under reduced oxygen partial pressure. The composition and microstructural evolution of secondary phases during the sintering process were characterized by SEM, XRD and EDS. Using high resolution SEM, the (Ca,Sr)(2)CuO3 (2:1), CuO and (Ca,Sr)(14)Cu24O41 (14:24) phases could be clearly identified, and details of the Bi-2212, Bi-2223 structure, as well as the quenched liquid region could be also observed. Experiments showed the liquid region of quenched samples contained small Cu-rich precipitates, and the majority of the liquid was rich in Pb, Bi and Ca. The increase of the liquid region area fraction and the disappearance of the 2212 phase both take place quickly, in contrast to the slower development of the total secondary phase area fraction. The amount of the large secondary phase particles was lowest for samples sintered at 830 degreesC in 8.5% O-2. At higher temperatures, the amount of the 2:1 phase increased and the particle size of the 14:24 became larger, while at lower temperatures, the CuO particles appeared at very beginning and tended to grow rather fast. (C) 2003 Elsevier B.V. All rights reserved. [References: 10]
机译：已经研究了Bi-2223 / Ag胶带中次生相的形成和生长。在降低的氧气分压下，在几个温度下对样品进行不同时间的热处理。用SEM，XRD和EDS表征了烧结过程中次生相的组成和微观结构演变。使用高分辨率SEM，可以清楚地识别（Ca，Sr）（2）CuO3（2：1），CuO和（Ca，Sr）（14）Cu24O41（14:24）相，Bi-2212的详细信息，Bi-2223的结构以及淬灭的液体区域也可以观察到。实验表明，淬火样品的液体区域含有少量富铜沉淀物，并且大部分液体富含Pb，Bi和Ca。液体区域面积分数的增加和2212相的消失都很快发生，这与总次级相区域分数的发展较慢相反。对于在8.5％O-2中在830℃烧结的样品，次级相大颗粒的数量最低。在较高的温度下，2：1相的数量增加，而14:24的颗粒尺寸变大，而在较低的温度下，CuO颗粒从一开始就出现并趋于快速增长。 （C）2003 Elsevier B.V.保留所有权利。 [参考：10]

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