Structural and magnetic features of heterogeneously nucleated Fe-oxide nanoparticles |
| |
Authors: | K. Simeonidis S. Mourdikoudis I. Tsiaoussis M. Angelakeris C. Dendrinou-Samara O. Kalogirou |
| |
Affiliation: | 1. Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece;2. Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece |
| |
Abstract: | Iron oxide nanoparticles of diameter 14 nm were synthesized by applying Pt seed-assisted heterogeneous thermal decomposition of Fe(CO)5 in a two-stage procedure. The intense heating treatment resulted in a remarkable mean volume increment compared to previous studies. This method is able to control the nanoparticle mean diameter, keeping the demand for thermal energy at low levels. High-resolution electron microscopy images and the corresponding electron diffraction patterns revealed the appearance of a FePt3 core in each nanoparticle, surrounded by highly crystallized inverse spinel Fe3O4 formed after atmospheric oxidation, as shown by a combination of X-ray diffraction and chemical analysis. Magnetic measurements indicated that the presence of Pt-rich core does not cause any visible modification to the values of saturation magnetization and anisotropy constant of nanoparticles, compared to homogeneously nucleated iron oxide particles of the same size. |
| |
Keywords: | 75.50.Tt 61.46.Df 75.75.+a 75.50.Bb |
本文献已被 ScienceDirect 等数据库收录! |
|