Symmetry analysis of KD3(SeO3)2:SeO2− ESR spectra
| Autor: | G. M. Ribeiro, J. C. Machado da Silva, R. Gazzinelli, A. S. Chaves |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
chemistry.chemical_classification
Phase transition Ferroelasticity Chemistry General Chemistry Condensed Matter Physics Pyroelectricity law.invention Crystal Crystallography Nuclear magnetic resonance law Phase (matter) Materials Chemistry Symmetry (geometry) Electron paramagnetic resonance Inorganic compound |
| Zdroj: | Solid State Communications. 77:5-9 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/0038-1098(91)90416-s |
| Popis: | The symmetry analysis of KD 3 (SeO 3 ) 2 :SeO 2 - ESR spectra, in previous publications, is incompatible with C 2h symmetry of the low temperature phase. Such incompatibility motivated a suggestion that KD 3 (SeO 3 ) 2 might go to a pyroelectric phase at low temperature. The present work demonstrates that the correlated rotations of SeO 2 groups, induced in the phase transition, transform according to the representation B 3g of group D 2h , the same symmetry of the order parameter. Therefore, the ESR spectra are in harmony with the symmetry change in the transition D 2h → C 2h and the crystal cannot be pyroelectric. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|