Experimental study of MgB2 decomposition

被引：78

作者：

Fan, ZY ^{[1
]}

Hinks, DG

Newman, N

Rowell, JM

机构：

[1] Arizona State Univ, Dept Elect Engn, Tempe, AZ 85287 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[3] Arizona State Univ, Dept Chem & Mat Engn, Tempe, AZ 85287 USA

[4] Northwestern Univ, Inst Mat Res, Evanston, IL 60208 USA

来源：

APPLIED PHYSICS LETTERS | 2001年 / 79卷 / 01期

关键词：

D O I：

10.1063/1.1383804

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The thermal stability of MgB2 has been studied experimentally to determine the role of thermodynamic and kinetic barriers in the decomposition process. The MgB2 decomposition rate approaches one monolayer per second at 650 degreesC and has an activation energy of 2.0 eV. The evaporation coefficient is inferred to be similar to 10(-4), indicating that this process is kinetically limited. These values were inferred from in situ measurements using a quartz crystal microbalance and a residual gas analyzer, in conjunction with ex situ measurements of redeposited material by Rutherford backscattering spectroscopy and secondary ion mass spectroscopy. The presence of a large kinetic barrier to decomposition indicates that the synthesis of MgB2 thin films conditions may be possible with vacuum processing, albeit within a narrow window in the reactive growth conditions. (C) 2001 American Institute of Physics.

引用

页码：87 / 89

页数：3

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