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Issue 2, 2002
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Staged fluorine insertion into manganese oxides with Ruddlesden–Popper structures: LaSrMnO4F and La1.2Sr1.8Mn2O7F

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Abstract

The synthesis, structures and magnetic properties of two fluorine-intercalated layered manganates, LaSrMnO4F and La1.2Sr1.8Mn2O7F, are reported. Rietveld structure refinement based on time of flight neutron powder diffraction data indicates that both compounds are tetragonal (space group P4/nmm) with cell parameters a = 3.77696(7) Å, c = 14.1026(8) Å (LaSrMnO4F) and a = 3.8103(1) Å, c = 21.7220(2) Å (La1.2Sr1.8Mn2O7F). Fluorine occupies interstitial sites in only one of the two rock salt layers available in the unit cell, leading to novel staged intercalation structures. The interstitial fluorine increases the spacing between the two adjacent rock salt layers and thereby causes a significant reduction in the Mn–O apical bonds directed towards the intercalated regions. The Mn valences of both compounds are close to 4+, and no long range magnetic order was observed in the title compounds down to 5 K.

Graphical abstract: Staged fluorine insertion into manganese oxides with Ruddlesden–Popper structures: LaSrMnO4F and La1.2Sr1.8Mn2O7F

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Publication details

The article was received on 26 Jun 2001, accepted on 25 Oct 2001 and first published on 05 Dec 2001


Article type: Paper
DOI: 10.1039/B105550J
Citation: J. Mater. Chem., 2002,12, 264-267
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    Staged fluorine insertion into manganese oxides with Ruddlesden–Popper structures: LaSrMnO4F and La1.2Sr1.8Mn2O7F

    L. D. Aikens, L. J. Gillie, R. K. Li and C. Greaves, J. Mater. Chem., 2002, 12, 264
    DOI: 10.1039/B105550J

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