Influence of γ Radiation on the Crystal Structure of BiFeO3

Ivanov, S.A.; Stash, A.I.; Bush, A.A.; Korlyukov, A.A.; Boyko, V.M.; Ermakov, V.S.

Авторы: Ivanov S.A., Stash A.I., Bush A.A., Korlyukov A.A., Boyko V.M., Ermakov V.S.
Журнал: Russian Journal of Inorganic Chemistry
Том: 67
Номер: 5
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 588
Последняя страница: 597
DOI: 10.1134/S0036023622050096
Аннотация: Perfect single crystals of BiFeO3 have been grown by the solution-melt method. Chemical analysishas confirmed their cationic and anionic stoichiometry. Precision X-ray diffraction analysis has providedmore accurate structural data for BiFeO3 before and after γ-irradiation with a dose of 1.0 × 106 rad. It hasbeen established that the indicated structural characteristics of the BiFeO3 crystal are in satisfactory agreementwith the available literature data, although in our case a significant increase in their accuracy is observed(the R values (F > 2σ(F)) range from 0.017 to 0.023). For the first time, difference maps of the residual electrondensity have been constructed and possible positions of lone pairs of electrons for Bi3+ cations have beendetermined, which is important for establishing the structural conditionality of the ferroelectric properties inBiFeO3. The effect of lone electron pairs on the specific features of the structural framework has been studied.The characteristic features of cationic polyhedra in the structure have been analyzed, including the calculationof their distortions and the valence state of cations. It has been shown that the structure of BiFeO3 isresistant to irradiation with a given dose.
Добавил в систему: Сташ Адам Игаркович

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