title: K3(U3O6)(Si2O7) and Rb3(U3O6)(Ge2O7): a pentavalent-uranium silicate and germanate.
abstract: A new uranium(V) silicate, K3(U3O6)(Si2O7), and the germanate analogue, Rb3(U3O6)(Ge2O7), have been synthesized under high-temperature, high-pressure hydrothermal conditions and characterized by single-crystal X-ray diffraction. Their structures contain uranate columns formed of triple octahedral chains of the alpha-UF5 type linked by disilicate (or digermanate) units to form a 3-D framework structure. The valence state of uranium is confirmed by X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and magnetic susceptibility.
authors.affiliation: Department of Chemistry, National Central University, Chungli, Taiwan.
authors.forename: Chia-Hui
authors.initials: CH
authors.lastname: Lin
authors.forename: Chih-Shan
authors.initials: CS
authors.lastname: Chen
authors.forename: A A
authors.initials: AA
authors.lastname: Shiryaev
authors.forename: Ya V
authors.initials: YV
authors.lastname: Zubavichus
authors.forename: Kwang-Hwa
authors.initials: KH
authors.lastname: Lii