Magnetic properties and X-ray photoelectron spectroscopy of nanocrystalline Ho3Al5O12
| Autor: | B. Angelov, V. Lovchinov, Dimitar Petrov |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Magnetic moment Analytical chemistry chemistry.chemical_element General Chemistry Atmospheric temperature range Condensed Matter Physics Magnetic susceptibility Nanocrystalline material X-ray photoelectron spectroscopy chemistry General Materials Science Selected area diffraction Holmium High-resolution transmission electron microscopy |
| Zdroj: | Crystal Research and Technology. 46:1161-1166 |
| ISSN: | 0232-1300 |
| DOI: | 10.1002/crat.201100330 |
| Popis: | Nanocrystalline holmium aluminium garnet (Ho3Al5O12) has been prepared for the first time by modified Pechini's reaction after sintering the precursor gel at 1223 K. The nanomaterial has been characterized by X-ray diffraction (XRD), selected area electron diffraction (SAED) and high resolution transmission electron microscopy (HRTEM). The XRD pattern confirms the formation of single-phase Ho3Al5O12; the average size of the nanoparticles has also been determined. X-ray photoelectron spectroscopy (XPS) has been used to study the chemical composition and bonding in the as-prepared samples. The binding energies of core-level electrons in Ho, Al and O in the title material have been found slightly shifted compared to the values of the respective elements. DC magnetic susceptibility has been measured in the temperature range 2 – 260 K. Low effective magnetic moment of Ho3+, μeff = 1.35 µB and Weiss constant have been derived from the inverse magnetic susceptibility–temperature linear plot. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Databáze: | OpenAIRE |
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