Formation of Tetravalent Fe Ions in LaFeO3 Perovskite Through Mechanochemical Modification by Ball Milling. Issue 4 (19th February 2015)

• Record Type: Journal Article
• Authors: Uchiyama, Tomoki; Nishibori, Maiko; Einaga, Hisahiro; Teraoka, Yasutake; Krehula, S.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 4(2015)
• Page Start: 1047
• Page End: 1051
• Publication Date: 2015-02-19
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13513
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13513-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Mechanochemical modification of previously synthesized LaFeO₃ perovskite‐type oxide by a high‐energy ball milling was investigated to introduce Fe⁴⁺ ions or transform some Fe³⁺ into Fe⁴⁺ in LaFeO₃. X‐ray absorption fine structure studies revealed that the formation of Fe⁴⁺ ions into LaFeO₃ perovskite has been achieved at first time by ball milling at room temperature without any additives or replacement of La³⁺ ions by some divalent cations. The structural model of Fe⁴⁺ containing LaFeO₃ 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 O₂‐TPD. The synthesis of Fe⁴⁺‐containing LaFeO₃ perovskite by ball milling was able to produce the O₂ adsorption capacity of nonsubstituted perovskite‐type oxide.</p> </abstract>