The Family of Ln2Ti2S2O5 Compounds (Ln=Nd, Sm, Gd, Tb, Dy, Ho, Er, and Y): Optical Properties
| Autor: | J. Derouet, Christine Boyer-Candalen, Alain Meerschaut, Yves Moëlo, Pierre Porcher |
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| Rok vydání: | 2002 |
| Předmět: |
Absorption spectroscopy
Chemistry Band gap business.industry chemistry.chemical_element Crystal structure Condensed Matter Physics Neodymium Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Crystal Paramagnetism Crystallography Optics Absorption band Materials Chemistry Ceramics and Composites Condensed Matter::Strongly Correlated Electrons Physical and Theoretical Chemistry business |
| Zdroj: | Journal of Solid State Chemistry. 165:228-237 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.2002.9492 |
| Popis: | The optical properties of Ln 2 Ti 2 S 2 O 5 compounds ( Ln =Nd, Sm, Gd, Tb, Dy, Ho, Er, and Y) have been measured. Diffuse reflectance spectra revealed a strong absorption band above 2 eV, which explains the color of the compounds. Moreover, other bands, with a lower intensity, have been attributed to 4 f –4 f rare earth transitions. In the case of neodymium the derived energy level scheme is rich enough to determinate a set of phenomenological crystal field parameters that correctly reproduce the spectrum. These parameters were also calculated from the crystallographic structure, in a good agreement with the experiment. Finally, the paramagnetic susceptibility, well reproduced by the calculation, confirms that the rare earth is in a trivalent state. |
| Databáze: | OpenAIRE |
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