Mixed-Valence Uranium Germanate and Silicate: Cs-x((UO)-O-V) ((UO)-O-IV/V)(2)(Ge2O7)(2) (x=3.18) and Cs-4((UO)-O-V)((UO)-O-IV/V)(2)(Si2O7)(2)

作者：Chen Chun Liang; Quang Bac Nguyen; Chen Chih Shan; Lii Kwang Hwa^*

来源：Inorganic Chemistry, 2012, 51(14): 7463-7465.

DOI：10.1021/ic301091f

A new mixed-valence uranium germanate and the silicate analogue have been synthesized under hydrothermal conditions at 600 degrees C and 165 MPa. Their crystal structures contain infinite -U-V-O-U-IV/V-O-U-IV/V-O-U-V- chains that are connected by Ge2O7 or Si2O7 groups to form a 3D framework with six-ring channels where the Cs+ cations are located. Two of the Cs sites in the germanate are partially occupied. Bond-valence-sum calculation and an U 4f X-ray photoelectron spectroscopy study confirm the valence states of the uranium.

• 出版日期2012-7-16
• 单位中央民族大学