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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

Journal Article · · Zeitschrift fuer Kristallographie. Crystalline Materials
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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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0001089
OSTI ID:
1566731
Journal Information:
Zeitschrift fuer Kristallographie. Crystalline Materials, Vol. 234, Issue 6; ISSN 2194-4946
Publisher:
de Gruyter
Country of Publication:
United States
Language:
English

References (33)

Synthesis and crystal structure of two new uranyl oxychloro-vanadate layered compounds: M7(UO2)8(VO4)2O8Cl with M=Rb, Cs journal May 2003
Syntheses, Structures, and Characterization of Open-Framework Uranyl Germanates journal August 2010
U6+ Minerals and Inorganic Compounds: Insights into an Expanded Structural Hierarchy of Crystal Structures journal December 2005
Ordering of calcium and vacancies in calcium catapleiite CaZr[Si3O9] • 2H2O journal May 2016
Heating-induced phase transformation in zeolite brewsterite: new 4- and 5-coordinated (Si,Al) sites journal February 1999
Cs 4 UGe 8 O 20 : A Tetravalent Uranium Germanate Containing Four- and Five-Coordinate Germanium journal October 2011
Structural Characterization of the First Hydroxo-Bridged Plutonium Compound, (PuO 2 ) 2 (IO 3 )(μ 2 -OH) 3 journal July 2005
Synthesis, Structure, and Infrared Spectroscopy of the First Np 5+ Neptunyl Silicates, Li 6 (NpO 2 ) 4 (H 2 Si 2 O 7 )(HSiO 4 ) 2 (H 2 O) 4 and K 3 (NpO 2 ) 3 (Si 2 O 7 ) journal January 2008
Hydrothermal Synthesis, Study, and Classification of Microporous Uranium Silicates and Germanates journal March 2018
Pentacoordinated silicon in the high-pressure modification of datolite, CaBSiO 4 (OH) journal January 2018
Wyartite; crystallographic evidence for the first pentavalent-uranium mineral journal September 1999
Crystal-chemical and energetic systematics of wadeite-type phases A2BSi3O9 (A = K, Cs; B = Si, Ti, Zr) journal August 2005
REFINEMENT OF THE CRYSTAL STRUCTURE OF BILLIETITE, Ba [(UO2)6 O4 (OH)6] (H2O)8 journal October 2006
Crystal structure of the uranyl-oxide mineral rameauite [Crystal structure of the uranyl-oxide mineral rameauite] journal January 2016
Versatile Uranyl Germanate Framework Hosting 12 Different Alkali Halide 1D Salt Inclusions journal August 2018
VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data journal October 2011
Uranium(VI) Tetraoxido Core Coordinated by Bidentate Nitrate journal August 2010
Cs 8 U IV (U VI O 2 ) 3 (Ge 3 O 9 ) 3 ·3H 2 O: A Mixed-Valence Uranium Germanate with 9-Ring Channels journal May 2011
Spriggite, Pb 3 [(UO 2 ) 6 O 8 (OH) 2 ] (H 2 O) 3 , a new mineral with β-U 3 O 8 –type sheets: Description and crystal structure journal February 2004
Pentavalent Uranium Oxide via Reduction of [UO 2 ] 2+ Under Hydrothermal Reaction Conditions † journal November 2008
The crystal structure of ianthinite, [U24+(UO2)4O6(OH)4(H2O)4](H2O)5: a possible phase for Pu4+ incorporation during the oxidation of spent nuclear fuel journal October 1997
Incorporation mechanisms of actinide elements into the structures of U6+ phases formed during the oxidation of spent nuclear fuel journal May 1997
Topological complexity of crystal structures: quantitative approach journal April 2012
A Revised and Expanded Structure Hierarchy of Natural and Synthetic Hexavalent Uranium Compounds journal January 2016
Systematics of High-Pressure Silicate Structures journal January 2000
Structural characterization of pentacoordinate silicon in a calcium silicate journal December 1996
Applied Topological Analysis of Crystal Structures with the Program Package ToposPro journal May 2014
A closer look into close packing: pentacoordinated silicon in a high-pressure polymorph of danburite journal August 2017
Design of open-framework germanates journal April 2010
Formation of Open Framework Uranium Germanates: The Influence of Mixed Molten Flux and Charge Density Dependence in U-Silicate and U-Germanate Families journal August 2018
IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 36 [IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 36] journal May 2017
THE CRYSTAL STRUCTURE OF DEHYDRATED WYARTITE, Ca (CO3) [U5+ (U6+O2)2 O4 (OH)] (H2O)3 journal December 2006
SUPERFLIP – a computer program for the solution of crystal structures by charge flipping in arbitrary dimensions journal July 2007

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nuclear (including radiation effects)
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