Structural and Magnetic Properties of BaFeO Synthesized by Oxidizing BaFeO Obtained via Nebulized Spray Pyrolysis.

A vacancy-ordered perovskite-type compound BaFeO (BaFeO) was prepared by oxidizing BaFeO (2/) with the latter compound obtained by a spray pyrolysis technique. The structure of BaFeO was found to be isotypic to BaFeOF (2/) and can be written as BaFeFeO. Mössbauer spectroscopy and calculations were used to confirm mixed iron oxidation states, showing allocation of the tetravalent iron species on the tetrahedral site, and octahedral as well as square pyramidal coordination for the trivalent species within a G-type antiferromagnetic ordering.

On the Impact of the Degree of Fluorination on the ORR Limiting Processes within Iron Based Catalysts: A Model Study on Symmetrical Films of Barium Ferrate.

In this study, symmetrical films of BaFeO, BaFeOF and BaFeOF were synthesized and the oxygen uptake and conduction was investigated by high temperature impedance spectroscopy under an oxygen atmosphere. The data were analyzed on the basis of an impedance model designed for highly porous mixed ionic electronic conducting (MIEC) electrodes. Variable temperature X-ray diffraction experiments were utilized to estimate the stability window of the oxyfluoride compounds, which yielded a degradation temperature for BaFeOF of 590 °C and a decomposition temperature for BaFeOF of 710 °C.

Synthesis and characterisation of fluorinated epitaxial films of BaFeOF: tailoring magnetic anisotropy a lowering of tetragonal distortion.

In this article, we report on the synthesis and characterisation of fluorinated epitaxial films of BaFeOF low-temperature fluorination of thin films of BaFeO grown by pulsed laser deposition. Diffraction measurements show that fluoride incorporation only results in a contraction of the film perpendicular to the film surface, where clamping by the substrate is prohibitive for strong in-plane changes. The fluorinated films were found to be homogenous regarding the fluorine content over the whole film thickness, and can be considered as single crystal equivalents to the bulk phase BaFeOF.

Synthesis, structure and electrical conductivity of a new perovskite type barium cobaltate BaCoO(OH).

Perovskite oxides exhibiting mixed protonic and electronic conductivities have interesting applications in protonic ceramic fuel cells. In this work, we report on a hydrated phase of BaCoO1.80(OH)0.