Antiferromagnetism and Structure of Sr1−xBaxFeO2F Oxyfluoride Perovskites

Recently, a series of oxyfluorides, Sr1−xBaxFeO2F with x = 0, 0.25, 0.50, and 0.75 obtained through novel synthesis route, were characterized by X-ray neutron powder diffraction (NPD), magnetization measurements, 57Fe Mössbauer spectroscopy (MS). The data revealed random occupancy Sr Ba atoms at the A-cation site, statistical distribution O F anionic sublattice perovskite-like structure specified in space group Pm-3m. MS spectra analysis consistently indicated presence Fe3+ ions B-site, confirming stoichiometry. Magnetic determination from NPD room temperature established G-type antiferromagnetic arrangement all compositions moments about 3.5 μB oriented along c axis. In this study, we present analyze additional concerning low-temperature chemical magnetic Sr0.5Ba0.5FeO2F (x 0.5) SrFeO2F 0). Basically, three-dimensional is maintained down to 2 K, where it fully developed an ordered moment 4.25(5) μB/Fe for 0.5 4.14(3) 0. processing complemented new approach dependence order TN on lattice parameters, based hyperfine fields extracted temperature-dependent data.