Study the oxygen vacancies and Fe oxidation states in CaFeO3-δ perovskite nanomaterial

被引：21
作者：
Abdel-Khalek, E. K. [1 ]
Motawea, M. A. [1 ]
Aboelnasr, Mohamed A. [1 ]
El-Bahnasawy, H. H. [1 ]
机构：
[1] Al Azhar Univ, Dept Phys, Fac Sci, Cairo 11884, Egypt
来源：
PHYSICA B-CONDENSED MATTER | 2022年 / 624卷
关键词：
CaFeO3-delta; Crystal structure; X-ray photoelectron spectroscopy; Mossbauer spectroscopy; NONSTOICHIOMETRIC PEROVSKITE; MOSSBAUER-SPECTROSCOPY; PHASE-TRANSITION; HIGH-PRESSURE; DIFFRACTION; SYSTEM; GROWTH; ORDER; XPS; SR;
D O I：
10.1016/j.physb.2021.413415
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
CaFeO3-delta perovskite nanomaterial has been synthesized by sol-gel method. Rietveld analysis of the X-Ray diffraction (XRD) data of the CaFeO3-delta sample revealed orthorhombic perovskite structure (space group pcmn). Field emission scanning electron microscope (FE-SEM) of the CaFeO3-delta sample showed the agglomerations of various particles. Mossbauer measurement of the CaFeO3-delta sample showed that the value of delta 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-delta sample. Thermogravimetry analysis (TG) and differential scanning calorimetric (DSC) of the CaFeO3-delta sample revealed the presence of phase transitions. The magnetic properties of the CaFeO3-delta sample exhibit mainly antiferro-magnetic state as confirmed by Mossbauer measurement. Based on the obtained results, the presence of oxygen vacancies and mixed oxidation states of iron (Fe3+ and Fe4+) makes the CaFeO3-delta sample useful for industrial applications.
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页数：7
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