In the first paper of this series, a qualitative interpretation was given of the far infrared spectra of several sodium uranium fluorides in the NaF-UF4 system. The purpose of this work has been to obtain information concerning the U-F vibrations in the uranium complex fluorides in the KF-UF4 system and furthermore to relate the band location of the U-F stretching vibration with the change of valency states of uranium.
T. Soga, K. Ohwada, and M. Iwasaki, "Infrared Absorption Spectra of Potassium Uranium Fluorides," Appl. Spectrosc. 26, 482-483 (1972)