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Issue 5, 2014
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Fluorine insertion into the Ruddlesden–Popper phase La2BaFe2O7: the structure and magnetic properties of La2BaFe2O5F4

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Abstract

Fluorination of the n = 2 Ruddlesden–Popper phase La2BaFe2O7 occurs at ∼300 °C in flowing 10% F2 in N2 to form La2BaFe2O5F4. 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. La2BaFe2O5F4 becomes antiferromagnetically ordered at temperatures below ∼500 K, and the magnetic order shows a striking resemblance to that observed in La2BaFe2O7. 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 Fe3+ within the primary phase, but also indicates that fluorination results in some particle fragmentation to form a paramagnetic component of the fluorinated material.

Graphical abstract: Fluorine insertion into the Ruddlesden–Popper phase La2BaFe2O7: the structure and magnetic properties of La2BaFe2O5F4

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Publication details

The article was received on 04 Oct 2013, accepted on 22 Nov 2013 and first published on 25 Nov 2013


Article type: Paper
DOI: 10.1039/C3DT52769G
Dalton Trans., 2014,43, 2038-2043

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    Fluorine insertion into the Ruddlesden–Popper phase La2BaFe2O7: the structure and magnetic properties of La2BaFe2O5F4

    N. N. M. Gurusinghe, J. C. Fones, J. F. Marco, F. J. Berry and C. Greaves, Dalton Trans., 2014, 43, 2038
    DOI: 10.1039/C3DT52769G

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