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New Investigations of the Crystal Structure of Lead Germanate Pb5Ge3O11статья
Дата последнего поиска статьи во внешних источниках: 1 июня 2022 г.
- Авторы: Ivanova S.A., Stash A.I., Sorokin T.A.
- Журнал: Crystallography Reports
- Том: 67
- Номер: 3
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 361
- Последняя страница: 375
- DOI: 10.1134/S1063774522030099
- Аннотация: Perfect stoichiometric Pb5Ge3O11 single crystals have been synthesized by the flux method. Theircationic and anionic stoichiometry is confirmed by chemical analysis. The specificity of the ferroelectricphase transition at 450 K is determined using dielectric spectroscopy and second-harmonic laser generation.Precise X-ray diffraction analysis has been used to study the changes in the structure and ferroelectric propertiesin dependence of temperature. Difference residual electron-density maps have been constructed for thefirst time; the possible sites of lone electron pairs for some Pb+2 cations are indicated. The polar displacementsare calculated, and their temperature dependence is estimated. Peculiar features of polyhedra for allsymmetrically independent cations in the structure, including calculation of their distortions and valencestate, are analyzed. A set of ferroelectric active cations is selected based on the data obtained. Some importantaspects of the problem of structural conditionality of ferroelectric properties in Pb5Ge3O11 are discussed additionally.
- Добавил в систему: Сташ Адам Игаркович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Crystallography_Reports_2022_Pb5Ge3O11.pdf | 2,9 МБ | 13 мая 2022 [adam_stash] | |
| 2. | Экспертное заключение | ekspertnoe_zaklyuchenie_6251-284_PGO_2022_Kristallografiya.… | 1018,7 КБ | 13 мая 2022 [adam_stash] |