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Electronic Structures of Fe in La 1– x Ca x FeO 3– y
Author(s) -
Li Jiangong,
Cai Xiaohong,
Wang Tianmin
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221760117
Subject(s) - delocalized electron , hyperfine structure , valence (chemistry) , disproportionation , ion , crystallography , octahedron , spectral line , chemistry , mössbauer spectroscopy , electronic structure , electron , materials science , analytical chemistry (journal) , atomic physics , physics , crystal structure , computational chemistry , organic chemistry , catalysis , quantum mechanics , chromatography , biochemistry , astronomy
The isomer shift of La 1– x Ca x FeO 3– y decreases gradually with increasing x , indicating the gradually increasing average intermediate valence state of iron, which is interpreted as being due to electron delocalization among iron ions on identical octahedral sites. The Mössbauer spectra of La 0.50 Ca 0.50 ‐FeO 3– y and their theoretical treatment show that electron delocalization slows down with dropping temperature. Two magnetic hyperfine patterns in the spectrum of this compound at 80 K may be assigned to Fe 3+ and Fe 5+ by assuming a charge disproportionation according to the scheme 2Fe 4− → Fe 3+ + Fe 5+ .