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On the Valence State of Iron in Sr 0.5 2+ Ca 0.5 2+ Fe 0.5 4+ Me 0.5 4+ O 3 2−
Author(s) -
Fayek M. K.,
Elnimr M. K.,
El Hamalawy A.,
Sekina M. Abou
Publication year - 1989
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19895010804
Subject(s) - valence (chemistry) , ion , mössbauer spectroscopy , spin states , crystallography , analytical chemistry (journal) , spectroscopy , materials science , spectral line , mössbauer effect , atomic physics , physics , chemistry , quantum mechanics , chromatography , astronomy
Abstract Powder samples of Sr 0.5 Ca 0.5 Fe 0.5 Me 0.5 O 3 (Me = Co, Zr or Mn) and Sr 0.3 La 0.7 FeO 3 are investigated by X‐ray diffraction and Mössbauer effect spectroscopy. Analysis of the completely ordered spectra suggested three kinds of iron ions coexist in general where the resolution into the different valence state is clearly seen. The Mössbauer effect parameters values are found to be close to those expected for Fe 3+ , Fe 4+ and Fe 5+ indicating that some of the tetravalent iron ions in its high spin state disproportionate into Fe 3+ and Fe 5+ ions passing through temperature dependent intermediate valence states.