Abstract
Self-doped perovskite manganites with nominal composition La0.8−xSr0.2MnO3−δ (0 ≤ x ≤ 0.20) have been prepared by the sol-gel method. The highest heat treatment temperature used was 1073 K. The x-ray diffraction (XRD) patterns indicate that the samples had a single phase with the ABO3 perovskite structure when the doping content was x ≤ 0.10 and that when the doping content was x ≥ 0.15 the samples had two phases with the ABO3 perovskite structure being the dominant phase and Mn3O4 being the minor phase. On the basis of the thermal equilibrium theory of crystal defects, the contents of various ions were estimated for the perovskite phases in which there are Mn2+ ions and no vacancies at the A sites. The ion contents have been corrected by Rietveld fitting of the powder sample x-ray diffraction data. Magnetic measurements indicated that the evolution of the Curie temperature (TC) vs. the Mn4+ ion content ratio at the B sites of the ABO3 structure is in accord with experimental results for La1−xSrxMnO3 samples.
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