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The study of 57 Fe Mössbauer spectra for La 0.7 Sr 0.3 FeO 3−δ with different structure
Author(s) -
Li Guangshe,
Li Liping,
Zhao Muyu
Publication year - 1996
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.2221970123
Subject(s) - valence (chemistry) , orthorhombic crystal system , materials science , perovskite (structure) , mössbauer spectroscopy , grain size , ion , analytical chemistry (journal) , spectral line , sintering , crystallography , crystal structure , chemistry , metallurgy , physics , organic chemistry , chromatography , astronomy
Samples of La 0.7 Sr 0.3 FeO 3−δ were obtained by sintering the precursor prepared by the Polyethylene Glycol (PEG) method. The measurements of XRD and 57 Fe Mössbauer spectra showed that the heat treatment of the precursor at different temperatures leads to phase transformations from the orthorhombic to the cubic and finally to the rhombohedral phase, to an increase of average grain size, and to changes of the electronic states of the Fe ions. It was thought that in the perovskite oxides the conditions of synthesis or treatment may have an important influence on structure and properties by adjusting the valence state or/and introducing oxygen vacancies.