title: Thorium Chemistry in Oxo-Tellurium System under Extreme Conditions.
abstract: Through the use of a high-temperature/high-pressure synthesis method, four thorium oxo-tellurium compounds with different tellurium valence states were isolated. The novel inorganic phases illustrate the intrinsic complexity of the actinide tellurium chemistry under extreme conditions of pressure and temperature. Th2Te3O11is the first instance of a mixed-valent oxo-tellurium compound, and at the same time, Te exhibits three different coordination environments (TeIVO3, TeIVO4, and TeVIO6) within a single structure. These three types of Te polyhedra are further fused together, resulting in a [Te3O11]8-fragment. Na4Th2(TeVI3O15) and K2Th(TeVIO4)3are the first alkaline thorium tellurates described in the literature. Both compounds are constructed from ThO9tricapped trigonal prisms and TeVIO6octahedra. Na4Th2(TeVI3O15) is a three-dimensional framework based on Th2O15and Te2O10dimers, while K2Th(TeVIO4)3contains tungsten oxide bronze like Te layers linked by ThO9polyhedra. The structure of β-Th(TeIVO3)(SO4) is built from infinite thorium chains cross-linked by TeIVO32-and SO42-anions. Close structural analysis suggests that β-Th(TeIVO3)(SO4) is highly related to the structure of α-Th(SeO4)2. Additionally, the Raman spectra are recorded and the characteristic peaks are assigned based on a comparison of reported tellurites or tellurates.
authors.affiliation: Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich GmbH , 52428 Jülich, Germany.
authors.forename: Bin
authors.initials: B
authors.lastname: Xiao
authors.affiliation: Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich GmbH , 52428 Jülich, Germany.
authors.forename: Philip
authors.initials: P
authors.lastname: Kegler
authors.affiliation: Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich GmbH , 52428 Jülich, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Bosbach
authors.affiliation: Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich GmbH , 52428 Jülich, Germany.|Institut für Kristallographie, RWTH Aachen University , 52066 Aachen, Germany.
authors.forename: Evgeny V
authors.identifier: http://orcid.org/0000-0002-4919-5211
authors.initials: EV
authors.lastname: Alekseev