|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Chemical impact on crystal structure of the second-group metalsстатья
Статья опубликована в журнале из списка RSCI Web of Science
Статья опубликована в журнале из перечня ВАКСтатья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 6 декабря 2018 г.
- Авторы: Kozlov A.S., Zakharov A.N.
- Журнал: Вестник МГТУ им. Н.Э. Баумана. Серия «Естественные науки»
- Номер: 5
- Год издания: 2015
- Издательство: Изд-во МГТУ им. Н.Э. Баумана
- Местоположение издательства: М.
- Первая страница: 113
- Последняя страница: 125
- Аннотация: Under the atmospheric pressure and standard temperature, alkali metals crystallize isostructurally, but not in the form of close packing. they have a body-centered cubic unit cell. No structural isomorphism is observed in crystal structures of group 2 metals. As atomic number of group 2 metals increases, their crystal structures change. The lightest metals, beryllium and magnesium Mg, are crystallized in the form hexagonal close-packed structure, whereas calcium Ca and strontium Sr exhibit face-centered cubic unit cells. However, barium Ba and strontium Sr have body-centered structures, typical of alkali metals. Nowadays, there is no any unified explanation of what causes the lack of structural isomorphism in group 2 metals. The authors have some correlations explaning a reasonable crystalline structure expansion towards barium Ba and radium Ra. It is done by considering physical and chemical properties of group 2 metals, as well as dependences of atomic force characteristics on nucleus charge, atomic, and ionic radii. There are examples showing a correlation between changes in physical and chemical properties and crystalline structures of group 2 metals. The number of valence sp-electrons is necessary but not sufficient for choosing a crystallization mode.
- Добавил в систему: Захаров Александр Николаевич