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Influence of heat treatment on the vacancy content at the B‐site in the AB O 3 manganites La 0.6 Sr 0.1 MnO 3− δ
Author(s) -
Liu S. P.,
Zhang Y. G.,
Tang G. D.,
Qi W. H.,
Ji D. H.,
Li Y. F.,
Liu G. H.,
Xie Y.,
Chen W.,
Hou D. L.
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925515
Subject(s) - curie temperature , vacancy defect , rietveld refinement , perovskite (structure) , materials science , analytical chemistry (journal) , phase (matter) , diffraction , crystallography , solid solution , content (measure theory) , crystal structure , chemistry , ferromagnetism , condensed matter physics , physics , metallurgy , organic chemistry , chromatography , optics , mathematical analysis , mathematics
The effects of heat‐treatment temperature, T HT , and heat‐treatment time, t HT , on the structural and magnetic properties of manganites with a nominal composition La 0.6 Sr 0.1 MnO 3− δ , prepared by the sol–gel method, were investigated. The XRD spectra indicate that the samples have two phases with the $R\overline {3} c$ perovskite being the dominant phase and Mn 3 O 4 being the second phase. It was found that the Curie temperature of the samples varies as T HT and t HT are changed. Calculation of the ion content ratios at the A, B, and O sites in the AB O 3 perovskite phase on the basis of the thermal equilibrium theory of crystal defects, and Rietveld fitting of X‐ray powder diffraction data lead us to believe that the origin of this variation is due to the fact that the vacancy content, z , at B‐sites in the AB O 3 perovskite phase increases as T HT and t HT increase. The calculations also show that the samples are double‐phase compositions of La 0.6 Sr 0.1 Mn 1− y O 1.5(1.7‐ y + z ) /(Mn 3 O 4 ) y /3 .