NDLI: Synthesis and structural investigations of the double perovskites REBaFe2O5+w (RE=Nd, Sm)

Content Provider	Royal Society of Chemistry (RSC)
Author	Woodward, Patrick M. Karen, Pavel
Copyright Year	1999
Abstract	By selection of appropriately sized rare earth elements and suitable reaction atmosphere, a new double-perovskite-type iron oxide REBaFe 2 O 5+ w (RE=Nd and Sm) has been synthesized, with, ideally, all Fe atoms in square-pyramidal coordinations when w=0. Like in the related triple-perovskite-type YBa 2 Fe 3 O 8+ w ′ , the added oxygen atoms w are accommodated in the RE layer. The homogeneity range in w is very wide, extending from 0.02(1) for RE=Sm and 0.050(6) for RE=Nd to w=0.65 and w=0.80, respectively, seen in O 2 at 985 °C without the upper homogeneity limit being crossed. The most reduced REBaFe 2 O 5+ w phases oxidize very easily, even at room temperature. The crystal structure, as seen at room temperature after quenching from ca. 1000 °C, is tetragonal, except for the most reduced compositions for RE=Sm (w<0.045) and most oxidized compositions for RE=Nd (w=0.69 as an example) which are orthorhombic. For samples with w=0.5 low temperature (ca. 500 °C) annealing leads to ordering of the added oxygens within the rare earth layer. This ordering produces equal concentrations of square pyramidal and octahedral Fe 3+ . The ordered structure, a type which has not previously been observed, belongs to space group Pmna (no. 53) with a≈4a p , b≈a p and c≈2a p , where a p is the primitive cubic perovskite cell edge (a p ≈3.9 Å). Structural refinements were obtained by applying the Rietveld method to synchrotron X-ray powder diffraction data.
Starting Page	789
Ending Page	797
Page Count	9
File Format	PDF
ISSN	09599428
Volume Number	9
Issue Number	3
Journal	Journal of Materials Chemistry
DOI	10.1039/a809302d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Pmna Rietveld Iron oxide HMS H6 Oxygen Tetragonal crystal system Orthorhombic crystal system Nucleic acid thermodynamics Space group Perovskite Rietveld refinement Synchrotron Powder diffraction
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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