| Autor: |
Georg Völkel, R. de Beer, D. van Ormondt, A.F. Deutz, H. Barkhuijsen |
| Rok vydání: |
1984 |
| Předmět: |
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| Zdroj: |
Solid State Communications. 49:679-684 |
| ISSN: |
0038-1098 |
| DOI: |
10.1016/0038-1098(84)90220-5 |
| Popis: |
Hyperfine interaction frequencies of 1H and 39K nuclei near the AsO4-4 radical in X-ray irradiated KH2AsO4 (KDA) have been observed through the method of electron spin echo envelope modulation (ESEEM). This method enabled us to record nuclear hyperfine interaction (ENDOR-like) spectra around the ferroelectric phase transition of KDA for the first time. The ESEEM spectrum of 39K exhibits a clear change when passing the ferroelectric phase transition temperature, but that of close protons does not. The result for close protons is in agreement with the symmetry breaking of the AsO4-4 site as observed via the EPR spectrum [5]. Finally, at 4.2 K the hyperfine interaction parameters of a 39K nucleus near the AsO4-4 unit could be determined through the ESEEM method. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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