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Muon diffusion in Nb−H systems

Authors:	O. Hartmann E. Karlsson R. Wäppling A. Gustavsson-Seidel D. Richter R. Hempelmann W. J. Kossler B. Hitti J. Kempton W. F. Lankford C. E. Stronach

Affiliation:	(1) Dept. of Physics, Univ. of Uppsala, Uppsala, Sweden;(2) Inst. Laue-Langevin, Grenoble, France;(3) IFF KFA Jülich, Jülich, W-Germany;(4) Dept. of Physics, College William and Mary, 23185 Williamsburg, Virginia, USA;(5) Dept. of Physics, George Mason University, 22030 Fairfax, Virginia, USA;(6) Virginia State University, 23803 Petersburg, Virginia, USA

Abstract:	We have studied the muon diffusion in various Nb−H_X systems with 0.750.9 the muon linewidth as function of temperature has a smooth behaviour and the muon mobility is strongly correlated to the hydrogen diffusion in the beta phase. The activation energy for the μ⁺ diffusion is 160 meV, which is lower than that for protons. At hydrogen concentrations below 0.9, the muon diffusion behaviour is more complicated, and the influence of Nb−H phase transitions is evident. The implications for the local environment of the muon are discussed.

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