Effect of the synthesis conditions on the magnetic and electrical properties of the BaFeO3−x oxide: A metamagnetic behavior

The BaFeO2.95 oxide has been obtained from thermal decomposition of the [BaFe(C3H2O4)2(H2O)4] metallo-organic precursor at 800 °C under atmospheric oxygen pressure as small and homogeneous particles. From electronic paramagnetic resonance data, a metallic behavior in the 230–130 K temperature range has been observed. Magnetic measurements confirm the existence of a ferro-antiferromagnetic transition at 178 K. The magnetic properties of the BaFeO2.95 oxide are strongly dependent on both temperature and magnetic field with a metamagnetic behavior. The synthesis conditions play an important role on the morphology and the electrical and magnetic properties. The syntherization of the sample produces a dramatic change in the transport properties and the existence of conductivity disappears.