Effect of holmium additions on microstructure in YBa2Cu3O7-δ

被引：7

作者：

Goswami, R. ^{[1
,2
]}

Holtz, R. L. ^{[1
]}

Rupich, M. W. ^{[3
]}

Zhang, W. ^{[3
]}

Spanos, G. ^{[1
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] Sci Applicat Int Corp, Washington, DC 20003 USA

[3] Amer Superconductor Inc, Westborough, MA 01581 USA

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 20期

关键词：

nanoparticles; rare earth additions; superconductors; microstructure; electron microscopy;

D O I：

10.1016/j.actamat.2007.08.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of Y-Ho-Ba-Cu-O samples with two different levels of Ho, Ho/Y = 0.5 and 1.0, processed by the trifluoroacetate metalorganic deposition process, have been studied by transmission electron microscopy (TEM) techniques, including high-resolution TEM, conventional TEM and fine-probe energy-dispersive spectroscopy. Oxide nanoparticles with varying levels of Ho have been characterized in detail, and related to other microstructural features. At a lower level of Ho, the (110) coarse twins with the boundary spacing of 30-60 mm form. Further increase in Ho content considerably produces fine microtwins, and increases the density of nanoparticles and microtwins. Ho additions increase the critical current for the magnetic field parallel to the c-axis, and decrease it for the field parallel to the a-b plane, resulting in a decreased anisotropy of critical current with field angle compared with undoped Y-Ba-Cu-O samples processed under similar conditions. These trends are discussed in terms of the detailed microstructural observations. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：6746 / 6753

页数：8

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