Journal Article

FZJ-2023-01390

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Understanding of the Structural Chemistry in the Uranium Oxo-Tellurium System under HT/HP Conditions

Alekseev, E. (Corresponding author)FZJ* ; Yucheng, H. ; Langer, E.FZJ* ; Bin, X. ; Kegler, P.FZJ* ; Cao, X. ; Kunhong, H. ; Eichel, R.-A.FZJ*RWTH* ; Shuao, W.

2023
Frontiers Media Lausanne

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Please use a persistent id in citations: http://hdl.handle.net/2128/34239  doi:10.3389/fchem.2023.1152113

Abstract: The study of phase formation in the U-Te-O systems with mono and divalent cations under high-temperature high-pressure (HT/HP) conditions has resulted in four new inorganic compounds: K2[(UO2)(Te2O7)], Mg[(UO2)(TeO3)2], Sr[(UO2)(TeO3)2] and Sr[(UO2)(TeO5)]. Tellurium occurs as TeIV, TeV, and TeVI in these phases which demonstrate the high chemical flexibility of the system. Uranium (VI) adopts a variety of coordinations, namely, UO6 in K2[(UO2)(Te2O7), UO7 in Mg[(UO2)(TeO3)2] and Sr[(UO2)(TeO3)2], and UO8 in Sr[(UO2)(TeO5)]. The structure of K2[(UO2)(Te2O7)] is featured with one dimensional (1D) [Te2O7]4- chains along the c-axis. The Te2O7 chains are further linked by UO6 polyhedra, forming the 3D [(UO2)(Te2O7)]2- anionic frameworks. In Mg[(UO2)(TeO3)2], TeO4 disphenoids share common corners with each other resulting in infinite 1D chains of [(TeO3)2]4- propagating along the a-axis. These chains link the uranyl bipyramids by edge sharing along two edges of the disphenoids, resulting in the 2D layered structure of [(UO2)(Te2O6)]2-. The structure of Sr[(UO2)(TeO3)2] is based on 1D chains of [(UO2)(TeO3)2]∞2− propagating into the c-axis. These chains are formed by edge-sharing uranyl bipyramids which are additionally fused together by two TeO4 disphenoids, which also share two edges. The 3D framework structure of Sr[(UO2)(TeO5)] is composed of 1D [TeO5]4− chains sharing edges with UO7 bipyramids. Three tunnels based on 6-Membered rings (MRs) are propagating along [001], [010] and [100] directions. The HT/HP synthetic conditions for the preparation of single crystalline samples and their structural aspects are discussed in this work.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)

Appears in the scientific report 2023

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