| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1616688 | Journal of Alloys and Compounds | 2011 | 6 Pages |
Nanocrystalline Ni0.5Zn0.5Fe2O4 powders, synthesized by a combustion method are investigated by X-ray diffraction, vibrating sample magnetometry and Mössbauer spectroscopic techniques. We adopt a strategy to systematically control the particle sizes between 4 and 45 nm simply by changing the elemental stoichiometric coefficient, Φe, of the combustion mixture. Curie temperature of the superparamagnetic particles of size 4 nm is higher than that of the bulk particles. Interestingly, bigger particles (45 nm) show a comparable room temperature saturation magnetization and exceptionally very high Curie temperature of 833 K, when compared to that of the bulk Ni0.5Zn0.5Fe2O4 material (563 K).
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Control of sizes (4–45 nm) by changing elemental stoichiometric coefficient, Φe. ► Particles obtained from Φe > 1 show increase in Curie temperature, TC, by 82 K. ► Exceptionally high TC of 833 K for particles obtained from stoichiometric mixture. ► Off-stoichiometric spinel phase formation with frustrated surface spins is explored. ► Structural and magnetic properties are a complex function of processing parameters.
