La-added and pure MgFe 2 O 4 powders were prepared from a malic acid complex, and the effect of La-adding on the microstructure and specific surface area of MgFe 2 O 4 powder were examined. There were no traces of impurity phases for pure MgFe 2 O 4 powder in the X-ray diffraction measurement after calcination in the range of 600 to 800°C. When La atoms were added to MgFe 2 O 4 , the crystallite growth of MgFe 2 O 4 was suppressed remarkably, resulting in a higher specific surface area in comparison with the pure material, and the lattice volume increased. X-ray photoelectron spectroscopy measurements showed that the binding energies of Mg 2s, Fe 2p, O 1s, and La 3d signals were in good agreement with the Mg 2+ , Fe 3+ , O 21 , and La 3+ valence states, respectively. Scanning electron microscopy observations revealed that MgFe 2 O 4 powder shows an aggregation of granular particles and that the individual particles are tightly interconnected with each other, whereas smaller particles compared with pure MgFe 2 O 4 were observed for the La-added powder. It was found from the N 2 adsorption measurement, moreover, that the amount of mesopore increases with La addition.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry