2024-03-28T10:47:54Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1144622020-03-20T10:43:43Zcom_10261_34com_10261_5col_10261_287
Fluorine insertion into the Ruddlesden-Popper phase La2BaFe 2O7: The structure and magnetic properties of La 2BaFe2O5F4
Gurusinghe, N.N.M.
Fones, J.C.
Marco, J.F.
Berry, F.J.
Greaves, C.
Fluorination 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.
Peer Reviewed
2015-04-29T10:21:27Z
2015-04-29T10:21:27Z
2014
2015-04-29T10:21:27Z
artículo
http://purl.org/coar/resource_type/c_6501
doi: 10.1039/c3dt52769g
issn: 1477-9226
Dalton Transactions 43: 2038- 2043 (2014)
http://hdl.handle.net/10261/114462
10.1039/c3dt52769g
none
Royal Society of Chemistry (UK)