<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Nitriding of nanocrystalline iron was studied under the atmosphere of pure ammonia and in the mixtures of ammonia - hydrogen - nitrogen at temperatures between 350°C and 500°C using thermogravimetry and x-ray diffraction. Three stages of nitriding were observed and have been ascribed to the following schematic reactions: (1) α-Fe → γ'-Fe4N, (2) γ'- Fe4N → ε - Fe3N and (3) ε - Fe3N → ε - Fe2N. The products of these reactions appeared in the nitrided nanocrystalline iron not sequentially but co-existed at certain reaction ranges. The dependence of a reaction rate for each nitriding stage on partial pressure of ammonia is linear. Moreover, a minimal ammonia partial pressure is required to initiate the nitriding at each stage.</abstract>

Nitriding of nanocrystalline iron was studied under the atmosphere of pure ammonia and in the mixtures of ammonia - hydrogen - nitrogen at temperatures between 350°C and 500°C using thermogravimetry and x-ray diffraction. Three stages of nitriding were observed and have been ascribed to the following schematic reactions: (1) α-Fe → γ'-Fe4N, (2) γ'- Fe4N → ε - Fe3N and (3) ε - Fe3N → ε - Fe2N. The products of these reactions appeared in the nitrided nanocrystalline iron not sequentially but co-existed at certain reaction ranges. The dependence of a reaction rate for each nitriding stage on partial pressure of ammonia is linear. Moreover, a minimal ammonia partial pressure is required to initiate the nitriding at each stage.

Kinetics of nanocrystalline iron nitriding

Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, ul. Pułaskiego 10,70-322 Szczecin, Poland

Polish Journal of Chemical Technology

{"article-title":"Kinetics of nanocrystalline iron nitriding"}

Nitriding of nanocrystalline iron was studied under the atmosphere of pure ammonia and in the mixtures of ammonia - hydrogen - nitrogen at temperatures between...

Kinetics of nanocrystalline iron nitriding

Published Online: Apr 08, 2010

Page range: 38 - 43

DOI: https://doi.org/10.2478/v10026-010-0008-z

Keywords
iron nitrides, microporous materials, chemical synthesis, thermogravimetric analysis, X-ray diffraction

This content is open access.

Kinetics of nanocrystalline iron nitriding

Published Online: Apr 08, 2010

Page range: 38 - 43

DOI: https://doi.org/10.2478/v10026-010-0008-z

Keywordsiron nitrides, microporous materials, chemical synthesis, thermogravimetric analysis, X-ray diffraction

This content is open access.

Keywords
iron nitrides, microporous materials, chemical synthesis, thermogravimetric analysis, X-ray diffraction