|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ИНХС РАН |
||
Synthesis, crystal structures and properties of the new compounds K7−xAg1+x(XO4)4 (X = Mo, W)статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 января 2018 г.
- Авторы: Spiridonova Tatyana S., Solodovnikov Sergey F., Savina Aleksandra A., Solodovnikova Zoya A., Stefanovich Sergey Yu, Lazoryak Bogdan I., Korolkov Iliya V., Khaikina Elena G.
- Журнал: ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY
- Том: 73
- Номер: 12
- Год издания: 2017
- Издательство: John Wiley & Sons Inc.
- Местоположение издательства: United States
- Первая страница: 1071
- Последняя страница: 1077
- DOI: 10.1107/S2053229617015674
- Аннотация: Two new isostructural compounds, namely heptapotassium silver tetrakis(tetraoxomolybdate), K7–xAg1+x(MoO4)4 (0 x 0.4), and heptapotassium silver tetrakis(tetraoxotungstate), K7–xAg1+x(WO4)4 (0 x 0.4), have been synthesized and found to crystallize in the polar space group P63mc (Z = 2) with the unit-cell dimensions a = 12.4188 (2) and c = 7.4338 (2) A˚ for K6.68Ag1.32(MoO4)4 (single-crystal data), and a = 12.4912 (5) and c = 7.4526 (3) A˚ for K7Ag(WO4)4. Both structures represent a new structure type, with characteristic [K1(XO4)6] ‘pinwheels’ of K1O6 octahedra and six XO4 tetrahedra (X = Mo, W) connected by common opposite faces into columns along the c axes. The octahedral columns are linked to each other through Ag1O4 tetrahedra along with the K2 and K3/Ag2 polyhedra, forming the polar rods (Ag1O4–X1O4–empty octahedron– Ag1O4). Ag1 is located almost at the centre of the largest face of its coordination tetrahedron and seems to have some mobility. The new structure type is related to the Ba6Nd2Al4O15 and CaBaSiO4 types, and to other structures of the α-K2SO4–glaserite family. The differential scanning calorimetry (DSC) and second harmonic generation (SHG) results show that both compounds undergo first-order phase transformations to high-temperature centrosymmetric phases.
- Добавил в систему: Стефанович Сергей Юрьевич