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Mg[(UO2 ) 2 (Ge2 O6(OH)2 ] · (H2 O)4.4, a novel compound with mixed germanium coordination: cation disordering and topological features of β-U3 O8 type sheetsстатья
- Авторы: Fabrice Dal Bo, Aksenov Sergey M., Burns Peter C.
- Журнал: Zeitschrift für Kristallographie – Crystalline Materials
- Год издания: 2019
- Издательство: Walter de Gruyter
- Местоположение издательства: Berlin, Germany
- DOI: 10.1515/zkri-2018-2156
- Аннотация: A novel hydrated magnesium uranyl germanate, Mg[(UO2)2(Ge2O6(OH)2)] · (H2O)4.4, has been synthesized under hydrothermal conditions at 200 °C. The orthorhombic unit-cell parameters are a = 10.829(6), b = 7.625(4), c = 16.888(10) Å, V = 1394.5(1) Å3, space group Cmcm, Z = 4. The crystal structure is based on β-U3O8-type sheets of corner- and edge-sharing U6+O7 pentagonal bipyramids. The GeO3(OH) tetrahedra and GeO4(OH) trigonal bipyramids are linked to form [Ge2φ8] diortho groups that fill the hexagonal-shaped windows within the sheets. The uranyl germanate layers are connected through Mgφ6 octahedra. The disorder of the [Ge2φ8] diortho groups leads to different local structure types with layered- and framework-like characters. A review of the crystal structures of uranyl minerals and actinide-bearing synthetic compounds based on β-U3O8 topological-type sheets is provided. Structural complexity parameters (IG,total = 176.19 bits/unit cell) indicate that the title compound is one of the simplest actinyl compounds among this family.
- Добавил в систему: Аксенов Сергей Михайлович