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Formation of Tetravalent Fe Ions in LaFeO 3 Perovskite Through Mechanochemical Modification by Ball Milling
Author(s) -
Uchiyama Tomoki,
Nishibori Maiko,
Einaga Hisahiro,
Teraoka Yasutake
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13513
Subject(s) - ball mill , materials science , xanes , perovskite (structure) , ion , oxide , mechanochemistry , solid solution , chemical engineering , inorganic chemistry , mineralogy , spectral line , nanotechnology , metallurgy , chemistry , organic chemistry , physics , astronomy , engineering
Mechanochemical modification of previously synthesized LaFeO 3 perovskite‐type oxide by a high‐energy ball milling was investigated to introduce Fe 4+ ions or transform some Fe 3+ into Fe 4+ in LaFeO 3 . X‐ray absorption fine structure studies revealed that the formation of Fe 4+ ions into LaFeO 3 perovskite has been achieved at first time by ball milling at room temperature without any additives or replacement of La 3+ ions by some divalent cations. The structural model of Fe 4+ containing LaFeO 3 could be described as with a modified perovskite having equal amounts of La and Fe vacancies, which is supported by a good correlation between the results of Fe K‐edge XANES spectra and O 2 ‐TPD. The synthesis of Fe 4+ ‐containing LaFeO 3 perovskite by ball milling was able to produce the O 2 adsorption capacity of nonsubstituted perovskite‐type oxide.