Effects of bulk impurity concentration on the reactivity of metal surface: sticking of hydrogen molecules and atoms to polycrystalline Nb containing oxygen.

Effects of bulk impurity concentration on the reactivity of metal surface: sticking of hydrogen molecules and atoms to polycrystalline Nb containing oxygen. Research Abstract Details 

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Effects of bulk impurity concentration on the reactivity of metal surface: sticking of hydrogen molecules and atoms to polycrystalline Nb containing oxygen. Abstract Text:

Yuji Hatano,Kuniaki Watanabe,Alexander Livshits,Andrei Busnyuk,Vasily Alimov,Yukio Nakamura,Ken-Ichi Hashizume,Yuji Hatano,Kuniaki Watanabe,Alexander Livshits,Andrei Busnyuk,Vasily Alimov,Yukio Nakamura,Ken-ichi Hashizume,

Nonmetallic impurities segregated onto metal surfaces are able to drastically decrease the chemical reactivity of metals. In the present paper, effects of bulk impurities on the reactivity of metallic surfaces were investigated in a wide temperature range on an example of the sticking of hydrogen molecules and atoms to Nb [polycrystalline, with mainly (100)] containing solute oxygen. At all the investigated surface temperatures, T(S) (300-1400 K), we found the bulk oxygen concentration C(O) to have a strong effect on the integral probability, alpha(H(2) ), of dissociative sticking of H(2) molecules followed by hydrogen solution in the metal lattice: alpha(H(2) ) monotonically decreased by orders of magnitude with increasing C(O) from 0.03 to 1.5 at. %. The sticking coefficient alpha(H(2) ) was found to depend on T(S) but not on the gas temperature. The effect of C(O) on alpha(H(2) ) is explained by the presence of oxygen-free sites (holes in coverage) serving as active centers of the surface reaction in the oxygen monolayer upon Nb. In contrast to H(2) molecules, H atoms were found to stick to, and be dissolved in, oxygen-covered Nb with a probability comparable to 1, depending neither on C(O) nor on T(S). This proves that, unlike H(2) molecules, H atoms do stick to be dissolved mainly through regular surface sites covered by oxygen and not through the holes in coverage.

Effects of bulk impurity concentration on the reactivity of metal surface: sticking of hydrogen molecules and atoms to polycrystalline Nb containing oxygen. Publishing Authors By Initials

Y Hatano,K Watanabe,A Livshits,A Busnyuk,V Alimov,Y Nakamura,K Hashizume,Y Hatano,K Watanabe,A Livshits,A Busnyuk,V Alimov,Y Nakamura,K Hashizume,

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Effects of bulk impurity concentration on the reactivity of metal surface: sticking of hydrogen molecules and atoms to polycrystalline Nb containing oxygen. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of chemical physics

VOLUME: 127

Page Numbers: 204707

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ISSN: 0021-9606

DAY: 28

MONTH: Nov

YEAR: 2007

Effects of bulk impurity concentration on the reactivity of metal surface: sticking of hydrogen molecules and atoms to polycrystalline Nb containing oxygen. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Effects of bulk impurity concentration on the reactivity of metal surface: sticking of hydrogen molecules and atoms to polycrystalline Nb containing oxygen.

AFFILIATION: Hydrogen Isotope Research Center, University of Toyama, Toyama 930-8555, Japan. hatano@ctg.u-toyama.ac.jp

Country: United States

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MEDLINETA: J Chem Phys

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