Divacancies and the hydrogenation of Mg-Ti films with short range chemical order | Zendy

H. Leegwater | Zendy; H. Schut | Zendy; Werner Egger | Zendy; Andrea Baldi | Zendy; B. Dam | Zendy; S.W.H. Eijt | Zendy

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Divacancies and the hydrogenation of Mg-Ti films with short range chemical order

Author(s) -

H. Leegwater,

H. Schut,

Werner Egger,

Andrea Baldi,

B. Dam,

S.W.H. Eijt

Publication year - 2010

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3368698

Subject(s) - materials science , rutile , doppler broadening , hydrogen , positron , fluorite , analytical chemistry (journal) , chemical physics , electron , chemical engineering , chemistry , metallurgy , nuclear physics , physics , organic chemistry , chromatography , astronomy , engineering , spectral line

We obtained evidence for the partial chemical segregation of as-deposited and hydrogenated Mg1?yTiy films (0 ? y ? 0.30) into nanoscale Ti and Mg domains using positron Doppler-broadening. We exclusively monitor the hydrogenation of Mg domains, owing to the large difference in positron affinity for Mg and Ti. The electron momentum distribution broadens significantly upon transformation to the MgH2 phase over the whole compositional range. This reveals the similarity of the metal-insulator transition for rutile and fluorite MgH2. Positron lifetime studies show the presence of divacancies in the as-deposited and hydrogenated Mg-Ti metal films. In conjunction with the relatively large local lattice relaxations we deduce to be present in fluorite MgH2, these may be responsible for the fast hydrogen sorption kinetics in this MgH2 phase

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