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Título

Fluorine insertion into the Ruddlesden-Popper phase La2BaFe 2O7: The structure and magnetic properties of La 2BaFe2O5F4

AutorGurusinghe, N.N.M.; Fones, J.C.; Marco, J.F. ; Berry, F.J.; Greaves, C.
Fecha de publicación2014
EditorRoyal Society of Chemistry (Great Britain)
CitaciónDalton Transactions 43: 2038- 2043 (2014)
ResumenFluorination of the n = 2 Ruddlesden-Popper phase La2BaFe 2O7 occurs at ∼300 °C in flowing 10% F2 in N2 to form La2BaFe2O5F 4. This oxide fluoride contains 2F- ions in interstitial sites within the rocksalt regions and 2F- ions that have substituted for O2- ions in apical sites within the rocksalt layers. The fluorination results in an expansion along c of 7.6% to yield a tetragonal unit cell of dimensions a = 3.96237(7) Å, c = 22.3972(5) Å. The structure and magnetic properties have been examined by Mössbauer spectroscopy, neutron powder diffraction and magnetic susceptibility measurements. La 2BaFe2O5F4 becomes antiferromagnetically ordered at temperatures below ∼500 K, and the magnetic order shows a striking resemblance to that observed in La2BaFe 2O7. The magnetic moments on Fe3+ are perpendicular to [001] and aligned along ±{100} directions above 300 K, but at temperatures below 200 K, they rotate by 45° to lie along ±{110}. Mössbauer spectroscopy suggests the presence of Fe 3+ within the primary phase, but also indicates that fluorination results in some particle fragmentation to form a paramagnetic component of the fluorinated material. © 2014 The Royal Society of Chemistry.
URIhttp://hdl.handle.net/10261/114462
DOI10.1039/c3dt52769g
Identificadoresdoi: 10.1039/c3dt52769g
issn: 1477-9226
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