Enhanced magnetization in V Fe3−O4 nanoparticles
| Autor: | Elke Arenholz, Vanessa L. Pool, Yves Idzerda, M.T. Kleb, C. L. Chorney |
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| Rok vydání: | 2015 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Absorption spectroscopy Magnetic circular dichroism Magnetism Analytical chemistry Vanadium chemistry.chemical_element Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Magnetization Nuclear magnetic resonance chemistry Magnetic nanoparticles |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 396:304-307 |
| ISSN: | 0304-8853 |
| Popis: | Nanoparticles of VxFe3−xO4 with up to 33% vanadium doping (x=0 to 1) and a 9 nm diameter are investigated in order to determine the site preference of the vanadium and the magnetic behavior of the nanoparticles. The iron and vanadium L23-edge X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (MCD) spectra are used to identify that vanadium initially substitutes into the tetrahedral iron site as V3+ and that the average iron moment is observed to increase with vanadium concentration up to 12.5% (x=.375). When the vanadium incorporation exceeds 12.5%, the XAS and MCD show that the vanadium begins substituting as V2+ in the octahedral coordination. This coincides with a rapid reduction of the average moment to zero by 25% (x=.75). The frequency-dependent alternating-current magnetic susceptibility (ACMS) displays a substantial increase in blocking temperature with vanadium concentration and indicated substantial variation in the strength of inter-particle interactions. |
| Databáze: | OpenAIRE |
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