Macrosegregation of Y2BaCuO5 particles in top-seeded melt textured monoliths

被引：23

作者：

Delamare, MP

Walter, H

Bringmann, B

Leenders, A

Freyhardt, HC

机构：

[1] Univ Gottingen, Inst Mat Phys, D-37073 Gottingen, Germany

[2] Univ Quebec, INRS Energie & Mat, Quebec City, PQ, Canada

[3] Zentrum Funkt Werkstoffe Gottingen, D-37073 Gottingen, Germany

来源：

PHYSICA C | 1999年 / 323卷 / 3-4期

关键词：

melt-textured superconductors; Y-based cuprates; pushing/trapping; macrosegregation;

D O I：

10.1016/S0921-4534(99)00445-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Y2BaCuO5 (Y-211) particles distributed in the textured matrix play an important role for the superconducting properties. The Top-Seeded Melt Growth (TSMG) process always leads to a macrosegregation of Y-211. For TSMG and Multi-Seeded Melt Growth (MSMG) monoliths, the characterization of the distribution of the Y-211 particles was performed over slices in the (001) plane and (001) direction, respectively. As soon as the growth commences, a zone with a low content of less than 10 mol% of Y-211 appears. The low content of Y-211 can mainly be explained by the pushing/trapping model. This model relates the radii of the smallest trapped Y-211 particles to the growth rate. Furthermore, when the undercooling Delta T reaches 25 degrees C, the growth front stops to push the particles and starts to trap them. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：107 / 114

页数：8

共 28 条

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