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@PHDTHESIS{Xiao:826219,
author = {Xiao, Bin},
title = {{T}he crystal chemistry of novel thorium and uranium
compounds with oxo-anions from group {VI} of periodic table
({S}, {S}e, {T}e, {C}r, {M}o and {W})},
school = {RWTH-Aachen},
type = {Dr.},
reportid = {FZJ-2017-00465},
pages = {179},
year = {2016},
note = {RWTH-Aachen, Diss., 2016},
abstract = {This dissertation focus on the synthesis, phase studies and
physicochemical properties of novel thorium and uranium
compounds with the Group VI (S, Se, Te, Cr, Mo, W) of the
Periodic Table. All the studied compounds are listed in
Table 2.2 from the page 15. I subdivided all the newly
synthesized compounds into several chapters according to
their structural and topological differences.First, for
thorium molybdates and tungstates, almost all of these
compounds are based on corner-sharing of ThOx (x = 6, 8 and
9) and MoO4 or WOx (x = 4, 5, 6) polyhedra. Interestingly,
all these compounds can be seen as derived from a pure
thorium molybdate compound (ThMo2O8) which was isolated from
high-temperature solid-state synthesis method. Therefore,
the polymorphs of this most basic ThMo2O8 compound is
firstly introduced (see Chapter 3.1 from page 18). The
thermodynamic, electronic and vibrational properties of all
investigated ThMo2O8 polymorphs were studied using ab initio
calculations. Then, two subfamilies of thorium molybdates,
that is, rubidium thorium molybdate and cesium thorium
molybdate and their thermal and vibrational behaviors were
discussed in details in Chapter 4.1 from page 37 and Chapter
4.2 from page 50, respectively.Moreover, some new insights
about the complexity of thorium tungstates were also
discussed (Chapter 4.3 from page 59). Some novel thorium
molybdate and chromate compounds synthesized from aqueous
condition are discussed in Chapter 5 from page 71.In the
Chapter 8.2.4, the stereochemistry for thorium and uranium
compounds are introduced, especially thorium selinites and
uranyl tellurites (see Chapter 6.1 from page 82), thorium
tellurites (Chapter 6.2 from page 93), and uranyl tellurites
(Chapter 6.3 from page 99 for sodium uranyl tellurium and
Chapter 6.4 from page 110 for potassium uranyl tellurium,
respectively). In the actinide tellurium systems, additional
MoO3/WO3 were also used as the flux for the high-temperature
synthesis method to decrease the crystal growth temperature.
This also gives an opportunity to allow Te4+ anion to
interact with anion of Mo6+ or W6+, leading to a more
complex mixed oxo-anion system, which is reported in Chapter
7 from page 122.Last, some attractive features of structural
chemistry of actinides, such as cation-cation interaction of
uranyl groups(Chapter 8.1 from page 136), and the first
thorium compounds containing alkaline-earth or rare earth
metals (Chapter 8.2 from page 145) are discussed in Chapter
8.},
cin = {IEK-6},
cid = {I:(DE-Juel1)IEK-6-20101013},
pnm = {161 - Nuclear Waste Management (POF3-161) / Helmholtz Young
Investigators Group: Energy (HGF-YIG-Energy) / HITEC -
Helmholtz Interdisciplinary Doctoral Training in Energy and
Climate Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF3-161 / G:(DE-HGF)HGF-YIG-Energy /
G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-rwth-2016-012628},
url = {https://juser.fz-juelich.de/record/826219},
}