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Mechanism of the formation of micropores in the thermal decomposition of goethite to hematite
Author(s) -
Jia Feifei,
RamirezMuñiz Kardia,
Song Shaoxian
Publication year - 2015
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5744
Subject(s) - hematite , goethite , thermal decomposition , crystal (programming language) , decomposition , chemical engineering , materials science , adsorption , mineralogy , thermal , chemistry , thermodynamics , organic chemistry , physics , engineering , computer science , programming language
The mechanisms of the formation of micropores in the thermal decomposition of goethite to hematite have been studied through the measurements of X‐ray diffraction, Brunauer–Emmett–Teller adsorption and scanning electronic microscopy, as well as the estimation of crystal cell parameters in this work. The results have shown that the thermal decomposition led to the crystal cells of goethite to be contracted along the [010] and [001] directions and to be elongated along the [100] direction, forming nano‐scale and rod‐like hematite. It was the contractions along the two directions that led to the formation of the micropores in the hematite particles. Copyright © 2015 John Wiley & Sons, Ltd.