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Forbidden reflections induced by unit-cell elastic distortions in paratellurite crystalsстатья Тезисы
Дата последнего поиска статьи во внешних источниках: 20 апреля 2022 г.
- Авторы: Petrenko A., Ovchinnikova E., Novikov D., Kulikov A., Khadiev A., Marchenkov N., Zschornak M., Ludt C., Kozlovskaya K., Dmitrienko V., Blagov А.
- Журнал: Acta Crystallographica Section A: Foundations of Crystallography
- Том: 77
- Год издания: 2021
- Издательство: Blackwell Publishing Inc.
- Местоположение издательства: United Kingdom
- Первая страница: C786
- Последняя страница: C786
- DOI: 10.1107/S010876732108911X
- Аннотация: An experiment was carried out at P23 beamline of PETRA III synchrotron, devoted to the study of the changes in the forbiddenreflections 002 and 100 in TeO2 under applied electric field. These reflections are forbidden in conventional X-ray scattering, but canbe observed at the energies close to absorption L-edges of Te, due to appearance of dipole-dipole resonant contribution to the atomicfactor of Te. The experiment was carried out at the incident radiation energy, close to L1 edge of Te 4938 eV. For both reflections theazimuthal dependence and energy spectrum were measured with and without application of electric field. For 002 reflection electricfield magnitude was 500 and 750 V/mm, for 100 reflection it was 750 and 1050 V/mm.We have observed a change of azimuthal dependence (Fig.1) caused by the violation of a symmetry in electric field in accordance withthe predictions of preliminary theoretical calculations. Also we have observed a change of the energy spectrum at the field magnitudeof 500 V/mm. It is assumed that this change is caused by appearance of oxygen vacancies in the environment of Te. For reflection100 this change of the energy spectrum was even more obvious. This is justified because in this experimental geometry migration ofvacancies is more pronounced.
- Добавил в систему: Овчинникова Елена Николаевна