The magnetic properties of a-Fe 2 O 3 nanoparticles of different shapes (spherical, rhombohedral and acicular), prepared as powders by a chemical route, have been investigated. The particle size effect on the Morin transition (T M = 263 K in the bulk system) have been studied by analyzing the temper
Structural and magnetization studies on nanoparticles of Nd doped α-Fe2O3
✍ Scribed by Gaurav Goyal; Anjana Dogra; S. Rayaprol; S.D. Kaushik; V. Siruguri; H. Kishan
- Book ID
- 113784651
- Publisher
- Elsevier Science
- Year
- 2012
- Tongue
- English
- Weight
- 924 KB
- Volume
- 134
- Category
- Article
- ISSN
- 0254-0584
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Zinc-doped -Fe 2 O 3 has been prepared by hydrothermal methods. The zinc K-edge EXAFS and interatomic potential calculations indicate that Zn 2؉ ions substitute for Fe 3؉ ions in the lattice and are accompanied by oxygen vacancies. The 57 Fe MoK ssbauer spectra recorded between 296 and 18 K demonstr
The defect structure of divalent magnesium-doped -Fe 2 O 3 has been examined by Rietveld structure refinement of the X-ray powder diffraction data. The results show that the Mg 2؉ ions occupy the vacant interstitial octahedral sites as well as substituting on the two adjacent octahedral Fe 3؉ sites