Abstract
Nd 2Fe 14B based magnetic materials exhibit excellent magnetic properties and are widely used in many engineering applications. However, chemical synthesis of this compound is challenging. In this work, the formation mechanism of chemically synthesized Nd 2Fe 14B magnetic nanoparticles was studied. Nd, Fe and B precursors were converted to NdFeB oxide by the solgel method, reduction of these oxides by CaH 2 resulted in Nd 2Fe 14B nanoparticles. Nd 2Fe 14B phase formation resulted from two competing reactions: (a) Nd 2Fe 14B phase formation by direct combination of NdH 2, Fe and B, (b) Nd 2Fe 17 phase formation from NdH 2 and Fe, followed by Nd 2Fe 14B phase formation by the reaction of Nd 2Fe 17 and B. Addition of boron to NdFeB oxide during reduction resulted in improved magnetic properties. The activation energy for Nd 2Fe 14B phase formation was found to be 365 kJ mol -1. The optimum heat treatment temperature and time for Nd 2Fe 14B phase formation were found to be 800 °C and 90 min, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 224-230 |
| Number of pages | 7 |
| Journal | Journal of Solid State Chemistry |
| Volume | 186 |
| DOIs | |
| Publication status | Published - Feb 2012 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry
Keywords
- Chemical synthesis
- Magnetic nanoparticles
- Mechanism of formation
- Reductiondiffusion (RD) method