Abstract
AbstractMg and Nb‐doped Mg films were grown by rf magnetron sputtering and their structure was studied as a function of the hydrogen sorption‐desorption cycles. The Nb doping improves the H desorption kinetics: anyway the characteristic desorption time increases in the first eight cycles until the desorption kinetics attain a stationary condition. The as grown Mg films are found to be rich of vacancies, while in the as grown Nb doped Mg films small vacancy clusters are present. After eight cycles the dispersed Nb agglomerates forming clusters of few nanometers. The evolution, under H cycling, of the detected vacancies and vacancy clusters is found to be very different in the Mg and in the Nb‐doped Mg films. The results are discussed and correlated to the desorption kinetics of the two systems. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Published Version
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