Physics – Condensed Matter – Materials Science
Scientific paper
2009-10-22
Physics
Condensed Matter
Materials Science
13 pages, 5 figures. Paper accepted in Physical Review B
Scientific paper
Ab initio calculations and statistical mechanics are combined to elucidate the thermodynamics of H vacancies in MgH2. A general method based on a grand-canonical ensemble of defect configurations is introduced to model the exchange of hydrogen between crystalline MgH2 and gas-phase H2. We find that, at temperatures and hydrogen partial pressures of practical interest, MgH2 is capable of accommodating only very small concentrations of hydrogen vacancies, which consist mainly of isolated defects rather than vacancy clusters, contrary to what is expected from a simple energetic analysis.
de Leeuw Nora H.
Fisher Timothy S.
Grau-Crespo Ricardo
Smith Kyle C.
Waghmare Umesh V.
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