Direct observation of nanometer-scale Mg- and B-oxide phases at grain boundaries in MgB2

被引：80

作者：

Klie, RF

Idrobo, JC

Browning, ND

Regan, KA

Rogado, NS

Cava, RJ

机构：

[1] Univ Illinois, Dept Phys, Chicago, IL 60607 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[3] Princeton Univ, Princeton Mat Inst, Princeton, NJ 08544 USA

来源：

APPLIED PHYSICS LETTERS | 2001年 / 79卷 / 12期

关键词：

D O I：

10.1063/1.1404127

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Here we describe the results of an atomic resolution study of the structure and composition of both the interior of the grains, and the grain boundaries in polycrystalline MgB2. We find that there is no oxygen within the bulk of the grains but significant oxygen enrichment at the grain boundaries. The majority of grain boundaries contain BOx phases smaller than the coherence length, while others contain larger areas of MgO sandwiched between BOx layers. Such results naturally explain the differences in connectivity between the grains observed by other techniques. (C) 2001 American Institute of Physics.

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页码：1837 / 1839

页数：3

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