Abstract
A method for the preparation of pure amorphous Fe2O3 powder with particle size of 25 nm is reported in this article. Pure amorphous Fe2O3 can be simply synthesized by the sonication of neat Fe(CO)5 or its solution in decalin under an air atmosphere. The Fe2O3 nanoparticles are converted to crystalline Fe3O4 nanoparticles when heated to 420 °C under vacuum or when heated to the same temperature under a nitrogen atmosphere. The crystalline Fe3O4 nanoparticles were characterized by x-ray diffraction and Mössbauer spectroscopy. The Fe2O3 amorphous nanoparticles were examined by Transmission Electron Micrography (TEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), and Quantum Design SQUID magnetization measurements. The magnetization of pure amorphous Fe2O3 at room temperature is very low (<1.5 emu/g) and it crystallizes at 268 °C.
| Original language | English |
|---|---|
| Pages (from-to) | 402-406 |
| Number of pages | 5 |
| Journal | Journal of Materials Research |
| Volume | 12 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 1997 |
Bibliographical note
Funding Information:This research was supported by Grant No. 94-00230 from the US-Israel Binational Science Foundation (BSF), Jerusalem, Israel. Dr. Yu. Koltypin thanks the Ministry of Absorption, The Center for Absorption in Sciences, for its financial support. Professor A. Gedanken is grateful for the Bar-Ilan Research Authorities for supporting this project.
Funding Information:
We thank Professor Y. Yeshurun for helpful discussions and for making the facilities of the National Center for Magnetic Measurements at the Department of Physics, Bar-Ilan University available for this study. The study of the magnetic properties was supported by the Israel Science Foundation administered by the Israeli Academy of Sciences and Humanities.
Funding
This research was supported by Grant No. 94-00230 from the US-Israel Binational Science Foundation (BSF), Jerusalem, Israel. Dr. Yu. Koltypin thanks the Ministry of Absorption, The Center for Absorption in Sciences, for its financial support. Professor A. Gedanken is grateful for the Bar-Ilan Research Authorities for supporting this project. We thank Professor Y. Yeshurun for helpful discussions and for making the facilities of the National Center for Magnetic Measurements at the Department of Physics, Bar-Ilan University available for this study. The study of the magnetic properties was supported by the Israel Science Foundation administered by the Israeli Academy of Sciences and Humanities.
| Funders | Funder number |
|---|---|
| Ministry of Absorption | |
| United States-Israel Binational Science Foundation | |
| Israel Academy of Sciences and Humanities | |
| Israel Science Foundation |