Mössbauer characterization of calcium–ferrite oxides prepared by calcining Fe2O3 and CaO

Abstract

Calcium ferrite oxides were prepared by calcining a mixture powder of iron-and calcium oxide. The 57 Fe-Mössbauer spectra of the calcium ferrites oxides were measured, revealing that the products should be Ca 2 Fe 2 O 5 and CaFe 2 O 4 , the ratio of which was dependent of the Fe/Ca atomic ratio of the mixture powder.

A rapid one-step mechanosynthesis and characterization of nanocrystalline CaFe2O4 with orthorhombic structure

“…With increasing milling time, the sextet becomes asymmetric toward the inside of each line, slowly collapses, and is gradually replaced by a central doublet. This spectral component can be assigned to the CaFe 2 O 4 product [17]; the detailed analysis of Mössbauer data is given below. In this context, it is interesting to note that the Mössbauer spectrum of ␣-Fe 2 O 3 exhibits only a broadened sextet even if the particle size of the material reaches the nanoscale range; i.e., it does not display a superparamagnetic doublet and, thus, unreacted hematite can easily be detected in the Mössbauer spectra [3,13].…”

“…[16,17]. Nowadays, Ca-Fe-O complex oxides are promising materials for high-temperature electrochemical devices, such as ceramic membranes and electrodes for solid oxide fuel cells [18].…”

Study of solid state interactions in the systems ZnFe2O4 - CaO, ZnFe2O4 - MgO and zinc cake with CaO and MgO

“…; S -(Mg, Zn) Fe,O^, ZnFe,O,; 6, '7 -(Mg 'Zn) Fe,OT abie 1. Hyperfine parameters of the studied samples »M>»<ï^Tiu>a» obtaining of both ZnFefi^ and D. Hirabayashi et al[33] have shown the possibility of jointly producing two types of calcium ferrite -CaFe^O^ and Ca^Fe^Oj, respectively having doublet and sextet Mossbauer spectrums.…”

Superparamagnetic calcium ferrite nanoparticles synthesized using a simple sol-gel method for targeted drug delivery

“…[1,2]. In addition, CaFe 2 O 4 shows remarkable physical characteristics, such as high thermal stability, which makes it applicable over a wide temperature range [3].…”