Magnetic and optical properties and electron paramagnetic resonance of gadolinium-containing oxide glasses
| Autor: | A.V. Malakhovskii, René Berger, Eleonora Petrakovskaja, I. Bruckental, Irina S. Edelman, Anatoly Potseluyko, Yosef Yeshurun, Janis Kliava, T. V. Zarubina |
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| Rok vydání: | 2003 |
| Předmět: |
Absorption spectroscopy
Gadolinium Analytical chemistry chemistry.chemical_element Condensed Matter Physics Magnetic susceptibility Ion law.invention Nuclear magnetic resonance Absorption edge chemistry Absorption band law General Materials Science Absorption (chemistry) Electron paramagnetic resonance |
| Zdroj: | Journal of Physics: Condensed Matter. 15:6671-6681 |
| ISSN: | 1361-648X 0953-8984 |
| Popis: | Magnetic susceptibility, electron paramagnetic resonance (EPR) and optical absorption have been studied in a glass system 20La2O3–22Al2O3–23B2O3– 35(SiO2+GeO2) with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses and ascribed to clustering of Gd3+ ions. Computer simulations of the EPR spectra show that the short-range ordering in the environment of the Gd3+ ions is well preserved. The relative distribution widths of the ligand coordinates are less than 2%. In the more heavily doped glasses the EPR spectra are superpositions of signals arising from isolated ions and ferromagnetic clusters. The increase of Gd3+ concentration is shown to change substantially the strong optical absorption edge while only small changes of f–f absorption band characteristics are observed. This difference is associated with the different effect of the Gd ion clustering on the mechanisms of the strong absorption in the ultraviolet region and the f–f absorption. |
| Databáze: | OpenAIRE |
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