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Mössbauer Spectra of 57 Fe in La 0.75 M 0.25 Cr 0.75 Fe 0.25 O 3 (M = Ca, Sr, Ba)
Author(s) -
Zhang G.J.,
Yang J.G.,
Xiong H.,
Jia Y.Q.,
Liu M.L.,
Jin M.Z.
Publication year - 2000
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 - 10.1002/1521-3951(200010)221:2<751::aid-pssb751>3.0.co;2-r
Subject(s) - electronegativity , orthorhombic crystal system , valence (chemistry) , ion , alkaline earth metal , materials science , divalent , inorganic chemistry , quadrupole splitting , crystal structure , crystallography , mössbauer spectroscopy , chemistry , metal , metallurgy , organic chemistry
La 0.75 M 0.25 Cr 0.75 Fe 0.25 O 3 (M = Sr, Ba) compounds are synthesized by a wet chemical method, the crystal structure of the compounds belongs to the orthorhombic system. The Mössbauer spectra of 57 Fe reveal that all the iron ions in the compounds are trivalent and in high‐spin state. There is a linear relationship between the quadrupole splitting of the 57 Fe nucleus and the electronegativity of the M ion in La 0.75 M 0.25 Cr 0.75 Fe 0.25 O 3 (M = Ca, Sr, Ba). Unlike in La 1– x Sr x FeO 3 , the substitution of the divalent alkaline earth ion for the trivalent lanthanum ion does not lead to an increasing valence state of the Fe 3+ ion in La 0.75 M 0.25 Cr 0.75 Fe 0.25 O 3 (M = Sr, Ba). Doping the alkaline earth ion will more likely lead to an increasing valence state of the Cr 3+ ion.