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- W2025227460 abstract "CaFexTi1-xO3-y (0.05⩽x⩽0.60) and SrFexTi1-xO3-y (0.20⩽x⩽0.60) perovskites were prepared by solid state reaction and subjected to different heat treatments in different atmospheres. Mössbauer spectroscopy of the CaFexTi1-xO3-y could detect Fe4+ in all the samples, even in those heated at 1000 °C in Ar atmosphere for 10 hours. Fe3+ coordinated by six, five and four anions were also identified and the estimated hyperfine parameters were consistent with those previously reported for the CaFexTi1-xO3-x/2 oxides where all the Fe cations were present as Fe3+. The Fe4+/Fe3+ ratios estimated from Mössbauer data are in agreement with coulometric titration data. The absence of tetracoordinated Fe3+ in SrFexTi1-xO3-y suggests that in contrast to CaFexTi1-xO3-y no ordering of anion vacancies takes place even for x = 0.60 and explains the differences in the Fe concentration dependence of the electric transport properties of these materials." @default.
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- W2025227460 date "2001-08-16" @default.
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- W2025227460 title "Fe<sup>4+</sup>content and ordering of anion vacancies in partially reduced AFe<sub><i>x</i></sub>Ti<sub>1-<i>x</i></sub>O<sub>3-<i>y</i></sub>(A = Ca, Sr;<b><i>x</i></b>⩽0.6) perovskites. An<sup>57</sup>Fe Mössbauer spectroscopy study" @default.
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