X-Ray and23Na NMR Investigations on Na+– and Na+/La3+–β″-Al2O3Crystals
| Autor: | G. Balzer-Jöllenbeck, W. Urland, J. Köhler |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Lanthanide
Ion exchange Chemistry Inorganic chemistry Resonance Crystal structure Condensed Matter Physics Isotopes of sodium Electronic Optical and Magnetic Materials Ion Inorganic Chemistry NMR spectra database Crystallography Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Single crystal |
| Zdroj: | Journal of Solid State Chemistry. 122:315-320 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.1996.0119 |
| Popis: | The structure of a Na+/La3+–β″-Al2O3crystal (degree of exchange ξ = 80%) has been investigated by conventional single crystal X-ray diffraction methods at room temperature. The lanthanide ions occupy eightfold ccordinated mO (9d) as well as sevenfold coordinated BR sites (6c). Remaining Na+ions were found exclusively in BR positions.23Na NMR measurements were performed at room temperature before and after the exchange procedure. Two distinct23Na signals differing in angular dependence of the second order quadrupole resonance shifts were recorded for the pure Na+–β″-Al2O3crystal whereas in the case of the doped isomorph only one signal was detected. The23Na NMR signals were assigned to the two possible positions for the Na+ions in the conduction planes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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