Synthesis, structural and magnetic characterisation of the fully fluorinated compound 6H–BaFeO2F

Abstract

The compound 6H-BaFeO 2 F (P6 3 /mmc) was synthesised by the low temperature fluorination of 6H-BaFeO 3-d using polyvinylidenedifluoride (PVDF) as a fluorination

Magnetic interactions in cubic-, hexagonal- and trigonal-barium iron oxide fluoride, BaFeO2F

“…The single sextet arises from the single crystallographic site of the Fe ions can lead to a more covalent interaction which will result in the observed smaller values of B hf and for these sextet components. This is also in line with the value of the iron magnetic moments for the iron ions in the Fe1 and Fe2 sites determined by room temperature neutron diffraction [14] (Table 6) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 …”

“…BAB ), it is assigned the letter h [16]. For a stapling sequence ccc… the simple cubic perovskite structure is formed as found, for example, in SrFeO 3 whereas the hexagonal perovskite structure is obtained for the Furthermore, the magnetic structures of the hexagonal-and trigonal-modifications of BaFeO 2 F as revealed by neutron powder diffraction are complex [14,15] and, as might be expected, are different from those identified by neutron powder diffraction and 57 Fe Mössbauer spectroscopy in cubic BaFeO 2 F [9]. Cubic BaFeO 2 F shows G-type antiferromagnetic ordering, i. e. each iron atom possesses spin direction opposite to its nearest neighbours.…”

Vanadium Oxyfluoride/Few-Layer Graphene Composite as a High-Performance Cathode Material for Lithium Batteries

“…Disorder of oxide and fluoride ions is a well-known phenomenon observed for many perovskite-type transition metal oxyfluorides [29][30][31][32][33][34][35] which can be derived from a ccp stacking of AX 3 layers. In contrast, ordering of fluoride ions was found for many hexagonal type perovskite compounds [36][37][38][39] .…”

Crystallographic and Magnetic Structure of the Perovskite-Type Compound BaFeO2.5: Unrivaled Complexity in Oxygen Vacancy Ordering

“…and heavy alkaline earths) are found adjacent to light X-ray scatterers (e. g. O and F) 14,15,45 . The initial coupled Rietveld analysis of XRD and NPD data (relaxing all positional parameters from the starting model of Zou et al 28 ) generally gave a good description for the intensities of most of the superstructure reflections, but some of them showed significant misfit.…”