Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Infrared spectra (4 000-400 cm^-1) of solid samples in KBr microdisks were measured and interpreted for uranyl carbonate minerals, viz. rutherfordine and sharpite, and synthetic phases in the system UO₃-CO₂-H₂O; the mineral schoepite was studied for a comparison as well. The ν₃ fundamental belonging to the UO₂²⁺ antisymmetric stretching vibrations in rutherfordine, UO₂CO₃.x H₂O (0.2 > x ≥ 0), lies in the same range as for the hydrothermal phases (985 to 978 cm^-1), whereas in the case of sharpite, UO₂CO₃.H₂O or (UO₂)₆(CO₃)₅(OH)₂.7 H₂O or M_1-x²⁺.(H₃O)_2x(UO₂)₆(CO₃)₅(OH)₄.(6-2x) H₂O, this vibration appears in the range where it is displayed by phases formed at normal temperature and pressure (954-953 and 914-913 cm^-1). The IR spectrum of schoepite, UO₃.2H₂O, is published for the first time.