On the Sr1-xBaxFeO₂F Oxyfluoride Perovskites: Structure and Magnetism from Neutron Diffraction and Mossbauer Spectroscopy.

ABSTRACT: Four oxyfluorides of the title series (x = 0.00, 0.25, 0.50, 0.75) have been stabilized by topotactic treatment of perovskite precursors Sr1-xBaxFeO3-δ prepared by soft-chemistry procedures, yielding reactive materials that can easily incorporate a substantial amount of F atoms at moderate temperatures, thus avoiding the stabilization of competitive SrF₂ and BaF₂ parasitic phases. XRD and Neutron Powder Diffraction (NPD) measurements assess the phase purity and yield distinct features concerning the unit cell parameters' variation, the Sr and Ba distribution, the stoichiometry of the anionic sublattice and the anisotropic displacement factors for O and F atoms. The four oxyfluorides are confirmed to be cubic in all of the compositional range, the unit cell parameters displaying Vergard's l

SUBMITTER: Garcia-Ramos CA 

PROVIDER: S-EPMC5456977 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature