Complex oxides with perovskite structure RFeO3, where R are rare earth metals, represent an important class of functional materials. RFeO3 compounds are used in thermoelectric devices, solid oxide fuel cells, as membranes for partial oxidation of methane and oxygen cleaning, as catalysts for CO oxidation and decomposition of NOx, and as sensory materials.
The work deals with the study of the phase composition and crystal structure of new mixed ferrites Pr0,5R0,5FeO3 (R = Nd, Gd, Tb, Dy, Ho) obtained by solid state reactions technique. It was established that all samples synthesized adopt orthorhombic perovskite structure isotypic with GdFeO3.
In this study, BaFe1−xAlxO3-δ (0 ≤ x ≤ 0.3) perovskite-type oxides were prepared by sol-gel method using citric acid as chelating agent. The samples were subjected to various calcination temperatures in order to investigate the physicochemical properties of the oxide affected by the parameter. Thermogravimetric analysis, Fourier transform infrared spectroscopy and X-ray diffraction (XRD) techniques are used to explore precursor decomposition and to establish adequate calcination temperature for the preparation of the nano-powders.