The complex superstructure in Mg1-xAlxB2 at x ≈ 0.5

被引：39

作者：

Zandbergen, HW

Wu, MY

Jiang, H

Hayward, MA

Haas, MK

Cava, RJ

机构：

[1] Delft Univ Technol, Natl Ctr HREM, Lab Mat Sci, NL-2625 AL Delft, Netherlands

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

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

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2002年 / 366卷 / 04期

关键词：

MgB2; election microscopy; superstructure; substitution;

D O I：

10.1016/S0921-4534(01)01195-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electron diffraction and high resolution microscopy have been performed on Mg1-xAlxB2 with x congruent to 0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c-axis and about 10 nm in the a-b plane. The superstructure results in ring-shaped superreflections in the diffraction pattern. Irradiation by a strong electron beam results in a loss of the superstructure and a decrease of about 1% in the c lattice parameter. In situ heating and cooling on the other hand showed that the superstructure is stable from 100 to 700 K. Possible origins for the superstructure are proposed. (C) 2002 Published by Elsevier Science B.V.

引用

页码：221 / 228

页数：8

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