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- W2002001777 abstract "The oxygen-deficient perovskite system Ba1−xLaxFeO3−y (0 ≤ y ≤ 0.5) has been studied by Mössbauer spectroscopy and X-ray powder diffraction techniques. The value of y depends strongly on the conditions of preparation, but the materials remain a cubic peroskite for 0.1 ≤ x < 0.8. For small y there is a nominal charge disproportionation 2Fe4+ Fe3+ + Fe5+ with decreasing temperature which is related to the onset of magnetic ordering. For large y (∼0.5) there is no evidence for the existence of the ordered-vacancy structures which are known to exist for the CaLa and SrLa systems. By analogy with similar Sr/rare-earth systems it is proposed that the cubic phase has a macroscopic perovskite structure with magnetic coherence throughout the lattice. The oxygen vacancies can partially order into alternate FeO2 layers to form a coherent intergrowth of microdomains." @default.
- W2002001777 created "2016-06-24" @default.
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- W2002001777 date "1989-07-01" @default.
- W2002001777 modified "2023-10-16" @default.
- W2002001777 title "A study of the oxygen-deficient perovskite Ba1−xLaxFeO3−y by Mössbauer spectroscopy" @default.
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- W2002001777 doi "https://doi.org/10.1016/0022-4596(89)90205-3" @default.
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