XPS investigations on cesium uranates: mixed valency behaviour of uranium

Several pure cesium uranate phases were prepared (Cs2U2O7, Cs2U4O13, Cs2U4O 12, Cs4U5O17) and measured with X-ray diffraction (XRD) and X-ray photoelec tron spectroscopy (XPS. Detailed XPS scans of the main photoelectron peaks (U 4f, Cs 3d, O 1s and valence band) were made. Peak positions, peak widths and satellite positions were measured and compared between the uranates. A systematic shift in the position of the U 4f lines was found to be correla ted with the Cs/U ratio. The mixed valency behaviour of uranium was observe d and studied. Interpretation of the satellite structure of the U 4f peaks and the deconvolution of these peaks have been used to quantify the chemica l states of uranium present in the mixed valency compound Cs2U4O12 (C) 2000 Elsevier Science B.V. All rights reserved.