Diffusion parameters of B in Cu determined by β-radiation-detected NMR -: art. no. 224302

被引：14

作者：

Füllgrabe, M ^{[1
]}

Ittermann, B

Stöckmann, HJ

Kroll, F

Peters, D

Ackermann, H

机构：

[1] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany

[2] Univ Marburg, Zentrum Mat Wissensch, D-35032 Marburg, Germany

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.64.224302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using beta -radiation-detected nuclear magnetic resonance (beta -NMR) in the special form of cross-relaxation spectroscopy we studied the diffusional behavior of implanted B-12 nuclei in Cu single crystals at temperatures T=115-750 K. An extended and completely revised dynamic theory of nuclear cross relaxation is developed to analyze the experimental data. Especially the incorporation of (hitherto neglected) spin-lattice relaxation effects turned out to be an important improvement. Applying this formalism we obtain activation energies of E-a=0.57(5) eV for the migration of interstitial B, the dominating fraction for T less than or similar to 400 K, and of E-a =1.15(10) eV for substitutional B formed at higher temperatures. The previously found direct-exchange mechanism for the diffusion of substitutional B in Cu is confirmed by our analysis.

引用

页数：11

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