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Title: Mg[(UO2)2(Ge2O6(OH)2]·(H2O)4.4, a novel compound with mixed germanium coordination: cation disordering and topological features of β-U3O8 type sheets

Abstract

Abstract A novel hydrated magnesium uranyl germanate, Mg[(UO 2) 2(Ge 2O 6(OH) 2)]·(H 2O) 4.4, has been synthesized under hydrothermal conditions at 200 °C. The orthorhombic unit-cell parameters area=10.829(6),b=7.625(4),c=16.888(10) Å,V=1394.5(1) Å 3, space groupCmcm,Z=4. The crystal structure is based on β-U 3O 8-type sheets of corner- and edge-sharing U 6+O 7pentagonal bipyramids. The GeO 3(OH) tetrahedra and GeO 4(OH) trigonal bipyramids are linked to form [Ge 2φ 8] diortho groups that fill the hexagonal-shaped windows within the sheets. The uranyl germanate layers are connected through Mgφ 6octahedra. The disorder of the [Ge 2φ 8] 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-U 3O 8topological-type sheets is provided. Structural complexity parameters (I G,total=176.19 bits/unit cell) indicate that the title compound is one of the simplest actinyl compounds among this family.

Authors:
; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Univ. of Notre Dame, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566731
DOE Contract Number:  
SC0001089
Resource Type:
Journal Article
Journal Name:
Zeitschrift fuer Kristallographie. Crystalline Materials
Additional Journal Information:
Journal Volume: 234; Journal Issue: 6; Journal ID: ISSN 2194-4946
Publisher:
de Gruyter
Country of Publication:
United States
Language:
English
Subject:
nuclear (including radiation effects), materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly)

Citation Formats

Dal Bo, Fabrice, Aksenov, Sergey M., and Burns, Peter C. Mg[(UO2)2(Ge2O6(OH)2]·(H2O)4.4, a novel compound with mixed germanium coordination: cation disordering and topological features of β-U3O8 type sheets. United States: N. p., 2019. Web. doi:10.1515/zkri-2018-2156.
Dal Bo, Fabrice, Aksenov, Sergey M., & Burns, Peter C. Mg[(UO2)2(Ge2O6(OH)2]·(H2O)4.4, a novel compound with mixed germanium coordination: cation disordering and topological features of β-U3O8 type sheets. United States. doi:10.1515/zkri-2018-2156.
Dal Bo, Fabrice, Aksenov, Sergey M., and Burns, Peter C. Mon . "Mg[(UO2)2(Ge2O6(OH)2]·(H2O)4.4, a novel compound with mixed germanium coordination: cation disordering and topological features of β-U3O8 type sheets". United States. doi:10.1515/zkri-2018-2156.
@article{osti_1566731,
title = {Mg[(UO2)2(Ge2O6(OH)2]·(H2O)4.4, a novel compound with mixed germanium coordination: cation disordering and topological features of β-U3O8 type sheets},
author = {Dal Bo, Fabrice and Aksenov, Sergey M. and Burns, Peter C.},
abstractNote = {Abstract 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 area=10.829(6),b=7.625(4),c=16.888(10) Å,V=1394.5(1) Å3, space groupCmcm,Z=4. The crystal structure is based on β-U3O8-type sheets of corner- and edge-sharing U6+O7pentagonal 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 Mgφ6octahedra. 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-U3O8topological-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.},
doi = {10.1515/zkri-2018-2156},
journal = {Zeitschrift fuer Kristallographie. Crystalline Materials},
issn = {2194-4946},
number = 6,
volume = 234,
place = {United States},
year = {2019},
month = {5}
}

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