Abstract
CaFeO3-δ perovskite nanomaterial has been synthesized by sol-gel method. Rietveld analysis of the X-Ray diffraction (XRD) data of the CaFeO3-δ sample revealed orthorhombic perovskite structure (space group pcmn). Field emission scanning electron microscope (FE-SEM) of the CaFeO3-δ sample showed the agglomerations of various particles. Mössbauer measurement of the CaFeO3-δ sample showed that the value of δ is 0.262 and Fe oxidation states are Fe3+ in octahedral and Fe4+ in tetrahedral coordination. X-ray photoelectron spectroscopy (XPS) revealed that the presence of Fe3+, Fe4+ ions, and oxygen vacancies at the surface of the CaFeO3-δ sample. Thermogravimetry analysis (TG) and differential scanning calorimetric (DSC) of the CaFeO3-δ sample revealed the presence of phase transitions. The magnetic properties of the CaFeO3-δ sample exhibit mainly antiferromagnetic state as confirmed by Mössbauer measurement. Based on the obtained results, the presence of oxygen vacancies and mixed oxidation states of iron (Fe3+ and Fe4+) makes the CaFeO3-δ sample useful for industrial applications.
Highlights
CaFeO3-δ perovskite nanomaterials have been extensively attracted much attention as a result of the presence of oxygen vacancies, different electronic states of Fe ions, and the unique physical properties [13]
The oxygen vacancies and Fe oxidation states in CaFeO3-δ perovskite nanomaterial were investigated by using X-ray diffraction (XRD), Mössbauer spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetry analysis (TG), differential scanning calorimetric (DSC), and vibrating sample magnetometer (VSM)
CaFeO3-δ perovskite nanomaterial has been successfully synthesized by sol-gel method
Summary
CaFeO3-δ perovskite nanomaterials have been extensively attracted much attention as a result of the presence of oxygen vacancies, different electronic states of Fe ions, and the unique physical properties [13]. There are few studies on the relation between the structure and properties such as charge disproportionation and metal-insulator transition in CaFeO3-δ nanoparticle materials [4]. This relation in CaFeO3-δ depends on oxygen vacancies content and the valence states of Fe ions which is affected by the different preparation methods [6,7,8,9]. The purpose of this work is to study the oxygen vacancies and oxidation states of Fe ions in CaFeO3-δ nanomaterial which synthesized by sol-gel method
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