Hao Yucheng, Langer Eike M, Xiao Bin, Kegler Philip, Cao Xin, Hu Kunhong, Eichel Rüdiger-A, Wang Shuao, Alekseev Evgeny V
School of Energy Materials and Chemical Engineering, Hefei University, Hefei, China.
Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich GmbH, Jülich, Germany.
Front Chem. 2023 Mar 10;11:1152113. doi: 10.3389/fchem.2023.1152113. eCollection 2023.
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: K [(UO) (TeO)], Mg [(UO) (TeO)], Sr [(UO) (TeO)] and Sr [(UO) (TeO)]. Tellurium occurs as Te, Te, and Te in these phases which demonstrate the high chemical flexibility of the system. Uranium VI) adopts a variety of coordinations, namely, UO in K [(UO) (TeO), UO in Mg [(UO) (TeO)] and Sr [(UO) (TeO)], and UO in Sr [(UO) (TeO)]. The structure of K [(UO) (TeO)] is featured with one dimensional (1D) [TeO] chains along the -axis. The TeO chains are further linked by UO polyhedra, forming the 3D [(UO) (TeO)] anionic frameworks. In Mg [(UO) (TeO)], TeO disphenoids share common corners with each other resulting in infinite 1D chains of [(TeO)] propagating along the -axis. These chains link the uranyl bipyramids by edge sharing along two edges of the disphenoids, resulting in the 2D layered structure of [(UO) (TeO)]. The structure of Sr [(UO) (TeO)] is based on 1D chains of [(UO) (TeO)] propagating into the -axis. These chains are formed by edge-sharing uranyl bipyramids which are additionally fused together by two TeO disphenoids, which also share two edges. The 3D framework structure of Sr [(UO) (TeO)] is composed of 1D [TeO] chains sharing edges with UO 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.
对含一价和二价阳离子的U-Te-O体系在高温高压（HT/HP）条件下的相形成研究，已得到四种新的无机化合物：K[(UO)(TeO)]、Mg[(UO)(TeO)]、Sr[(UO)(TeO)]和Sr[(UO)(TeO)]。碲在这些相中以Te、Te和Te的形式存在，这表明该体系具有很高的化学灵活性。铀（VI）采用多种配位方式，即在K[(UO)(TeO)]中为UO，在Mg[(UO)(TeO)]和Sr[(UO)(TeO)]中为UO，在Sr[(UO)(TeO)]中为UO。K[(UO)(TeO)]的结构以沿轴的一维（1D）[TeO]链为特征。TeO链通过UO多面体进一步连接，形成3D[(UO)(TeO)]阴离子骨架。在Mg[(UO)(TeO)]中，TeO双楔体彼此共用公共角，形成沿轴传播的[(TeO)]无限1D链。这些链通过沿双楔体的两条边共用边连接铀酰双锥体，形成[(UO)(TeO)]的二维层状结构。Sr[(UO)(TeO)]的结构基于沿轴传播的[(UO)(TeO)]1D链。这些链由共用边的铀酰双锥体形成，另外还通过两个也共用两条边的TeO双楔体融合在一起。Sr[(UO)(TeO)]的3D骨架结构由与UO双锥体共用边的1D[TeO]链组成。基于六元环（MRs）的三条隧道沿[001][010]和[100]方向传播。本文讨论了制备单晶样品的高温高压合成条件及其结构方面。
