Nuclear and magnetic structures of new Ruddlesden-Popper oxide fluorides
La2BaFe2O7 (n=2 Ruddlesden-Popper structure) has been shown by the applicant to have a high degree of La/Ba order. This material undergoes an interesting magnetic reorientation at ~200 K. We have now synthesised two new oxide-fluoride phases from F-insertion reactions - La2BaFe2O5F4 and La2BaFe2O6F2. The structures of these phases have been partially determined by poweder XRD, but NPD is essential to resolve the O/F distribution, to determine whether any La/Ba redistribution occurs during fluorination, and to determine the magnetic order. In particular magnetic reorientation on cooling will be examined. Thes eobjectives can only be achieved using NPD data. These phases are extremely unusual in that the charge balance associated with fluorine insertion involves an equivalent amount of anion substition (F for O) rather than oxidation of Fe3+ to Fe4+.
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GREAVES Colin; FONES Julia and SUARD Emmanuelle. (2013). Nuclear and magnetic structures of new Ruddlesden-Popper oxide fluorides. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2265
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