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@ARTICLE{Li:845849,
author = {Li, Haijian and Kegler, Philip and Klepov, Vladislav V. and
Klinkenberg, Martina and Bosbach, Dirk and Alekseev, Evgeny},
title = {{C}omparison of {U}ranium({VI}) and {T}horium({IV})
{S}ilicates {S}ynthesized via {M}ixed {F}luxes {T}echniques},
journal = {Inorganic chemistry},
volume = {57},
number = {11},
issn = {1520-510X},
address = {Washington, DC},
publisher = {American Chemical Society},
reportid = {FZJ-2018-03052},
pages = {6734-6745},
year = {2018},
abstract = {Two uranium and two thorium silicates were obtained using
high temperature mixed fluxes methods. K14(UO2)3Si10O30
crystallizes in the P21/c space group and contains
open-branched sechser (six) single silicate chains, whereas
K2(UO2)Si2O6 crystallizes in the C2/c space group and is
built of unbranched achter (eight) silicate chains. The
crystals of K14(UO2)3Si10O30 and K2(UO2)Si2O6 are related by
increasing U/Si molar ratios, and both structures contain
the same secondary building units (SBUs), [USi6] heptamers.
The triangle diagram for all known A+–UO22+–SiO44–
phases demonstrates the high polymerization level of
silicate groups in the system, which was compared with the
family of A+–UO22+–BO33–/BO45– compounds. For both
thorium silicates, the transformation of K2ThSi2O7 to
K2ThSi3O9 was found to be a factor of the reaction time.
K2ThSi2O7 crystallizes in the C2/c space group and belongs
to the Na2SiVISi2O7 structure type. Its 3D framework
consists of diorthosilicate Si2O7 group and ThO6 octahedra.
Noncentrosymmetric K2ThSi3O9 crystallizes in the hexagonal
P63 space group and adopts mineral wadeite-type structure
based upon triorthosilicate Si3O9 rings and ThO6 octahedra.
The coordination environment of thorium for all existing
oxo-anion compounds including B, Si/Ge, P/As, Cr/Mo/W, and
S/Se/Te are summarized and analyzed. Additionally,
spectroscopic properties of all novel materials have been
studied.},
cin = {IEK-6},
ddc = {540},
cid = {I:(DE-Juel1)IEK-6-20101013},
pnm = {161 - Nuclear Waste Management (POF3-161) / Helmholtz Young
Investigators Group: Energy (HGF-YIG-Energy)},
pid = {G:(DE-HGF)POF3-161 / G:(DE-HGF)HGF-YIG-Energy},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29767508},
UT = {WOS:000434491700058},
doi = {10.1021/acs.inorgchem.8b01072},
url = {https://juser.fz-juelich.de/record/845849},
}