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Hydrogen Adsorption of Ruthenium: Isosteres of Solubility of Adsorbed Hydrogen

Published online by Cambridge University Press:  10 February 2011

S. Yu. Zaginaichenko ,
Z. A. Matysina ,
D. V. Schur  and
V. K. Pishuk
S. Yu. Zaginaichenko
Affiliation:
Institute for Problems of Materials Science of UAS, Kiev-150, P.O.Box 799, 252150 Ukraine, shurzag@ipms.kiev.ua
Z. A. Matysina
Affiliation:
State University, Dnepropetrovsk, 320000 Ukraine
D. V. Schur
Affiliation:
Institute of Hydrogen and Solar Energy, Kiev- 150, 252150 Ukraine
V. K. Pishuk
Affiliation:
Institute of Hydrogen and Solar Energy, Kiev- 150, 252150 Ukraine
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Abstract

The theoretical investigation of solubility isosteres of adsorbed hydrogen has been performed for free face (0001) of crystals with hexagonal close-packed lattice A3 of Mg type. The face free energy has been calculated and its dependence on temperature, pressure, hydrogen concentration and character of hydrogen atoms distribution over surface interstitial sites of different type has been defined. The equations of thermodynamic equilibrium and solubility of adsorbed hydrogen have been defined. The plots of isosteres in the region of phase transition from isotropic to anisotropic state have been constructed and it has been established that in anisotropic state the order in distribution of hydrogen atoms over interstitial sites of different type must become apparent. Comparison of the theoretical isosteres with experimental for ruthenium has been carried out, the isotropic-anisotropic state transition can stipulate a stepwise and break-like change in isosteres.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 513: Symposium H – Hydrogen in Semiconductors and Metals , 1998 , 99
Copyright
Copyright © Materials Research Society 1998

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References

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