Nitrogen uptake and rate-limiting step in low-temperature nitriding of iron | Zendy

D. K. Inia | Zendy; A. M. Vredenberg | Zendy; F.H.P.M. Habraken | Zendy; D.O. Boerma | Zendy

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Nitrogen uptake and rate-limiting step in low-temperature nitriding of iron

Author(s) -

D. K. Inia,

A. M. Vredenberg,

F.H.P.M. Habraken,

D.O. Boerma

Publication year - 1999

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.370808

Subject(s) - nitriding , limiting , nitrogen , nitride , decomposition , rate determining step , materials science , activation energy , metallurgy , iron nitride , catalysis , layer (electronics) , chemistry , inorganic chemistry , analytical chemistry (journal) , composite material , chromatography , mechanical engineering , biochemistry , organic chemistry , engineering

Recently, a method to nitride iron in NH3 ambients at low temperature (225–350 °C) has been developed. In this method, the Fe is covered with a thin (∼40 nm) Ni layer, which acts as a catalyst for the nitriding process. From experiments, in which the amount of nitrogen uptake is measured as a function of nitriding time, it is concluded that the decomposition of NH3 at the Ni surface contains the rate-limiting step in this low-temperature nitriding process. From a model calculation, it is further concluded that the reaction step NH3→NH2+H at the Ni surface is the rate-limiting step with an activation energy of ∼1.5 eV.

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