Abstract
Room-temperature magnetization hysterisis measurements were conducted on Mn0.5Zn0.5GdxFe(2-x)O4 ferrite nanoparticles, with x = 0, 0.5, 1.0, 1.5. The structure of this ferrite is normal spinel where the added of Gd3+ ions occupied the octahedral sites and replaces Fe3+ ions. The saturation magnetization was found to increase with the initial addition of the Gd3+ ions followed by a sharp decrease with further addition of Gd3+ ions. The Curie temperature was found to increase up to Gd3+ concentration of x = 1.0, and then decreases at x = 1.5. These results were attributed to the surface spins. Because the size of Gd3+ ions is larger than that of Fe 3+ ions, the substitution of Fe3+ ions with the Gd 3+ ions results in surface disorder which results in surface spins. A core-shell magnetization model was introduced where several factors were combined to explain our results.
Original language | English |
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Pages (from-to) | 489-494 |
Number of pages | 6 |
Journal | Crystal Research and Technology |
Volume | 44 |
Issue number | 5 |
DOIs | |
Publication status | Published - May 2009 |
Keywords
- Curie temperature
- Ferrites
- Nanoparticles
- Surface spins
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics