ChemInform Abstract: La2SrCr2O7F2: A Ruddlesden—Popper Oxyfluoride Containing Octahedrally Coordinated Cr4+ Centers.

Zhang, Ronghuan; Read, Gareth; Lang, Franz; Lancaster, Tom; Blundell, Stephen J.; Hayward, Michael A.

doi:10.1002/chin.201622012

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“…Compounds with Ruddlesden-Popper type structure A n+1 B n O 3n+1 are known for a variety of functional properties, among them superconductivity 1-5 , catalytic 6 , ferroelectric 7 and magnetic [8][9] properties. The member with n = 1 (A 2 BX 4 , often referred to as K 2 NiF 4 type structure) can be understood as being build-up of alternating layers of perovskite ABX and rock salt AX layers.…”

Section: Introductionmentioning

confidence: 99%

Topochemical Fluorination of La₂NiO_4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La₂NiO₃F₂

et al. 2018

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The Ruddlesden-Popper (KNiF) type phase LaNiOF was prepared via a polymer-based fluorination of LaNiO. The compound was found to crystallize in the orthorhombic space group Cccm ( a = 12.8350(4) Å, b = 5.7935(2) Å, c = 5.4864(2) Å). This structural distortion results from an ordered half occupation of the interstitial anion layers and has not been observed previously for KNiF-type oxyfluoride compounds. From a combination of neutron and X-ray powder diffraction and F magic-angle spinning NMR spectroscopy, it was found that the fluoride ions are only located on the apical anion sites, whereas the oxide ions are located on the interstitial sites. This ordering results in a weakening of the magnetic Ni-F-F-Ni superexchange interactions between the perovskite layers and a reduction of the antiferromagnetic ordering temperature to 49 K. Below 30 K, a small ferromagnetic component was found, which may be the result of a magnetic canting within the antiferromagnetic arrangement and will be the subject of a future low-temperature neutron diffraction study. Additionally, density functional theory-based calculations were performed to further investigate different anion ordering scenarios.

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Section: Introductionmentioning

confidence: 99%

Topochemical Fluorination of La₂NiO_4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La₂NiO₃F₂

et al. 2018

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ChemInform Abstract: La₂SrCr₂O₇F₂: A Ruddlesden—Popper Oxyfluoride Containing Octahedrally Coordinated Cr⁴⁺ Centers.

Abstract: The title compound is prepared by fluorination of La2SrCr2O7 at 310 °C under an O2/F2 gas mixture obtained by heating CuF2 separately at 500 °C under flowing oxygen.

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Topochemical Fluorination of La₂NiO_4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La₂NiO₃F₂

Topochemical Fluorination of La₂NiO_4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La₂NiO₃F₂

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ChemInform Abstract: La2SrCr2O7F2: A Ruddlesden—Popper Oxyfluoride Containing Octahedrally Coordinated Cr4+ Centers.

Abstract: The title compound is prepared by fluorination of La2SrCr2O7 at 310 °C under an O2/F2 gas mixture obtained by heating CuF2 separately at 500 °C under flowing oxygen.

Cited by 1 publication

References 1 publication

Topochemical Fluorination of La2NiO4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La2NiO3F2

Topochemical Fluorination of La2NiO4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La2NiO3F2

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ChemInform Abstract: La₂SrCr₂O₇F₂: A Ruddlesden—Popper Oxyfluoride Containing Octahedrally Coordinated Cr⁴⁺ Centers.

Topochemical Fluorination of La₂NiO_4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La₂NiO₃F₂

Topochemical Fluorination of La₂NiO_4+d: Unprecedented Ordering of Oxide and Fluoride Ions in La₂NiO₃F₂