Open AccessCharacterization of Sb-doped Bi2UO6 Solid Solutions by X-ray Diffraction and X-ray Absorption Spectroscopy
Author(s) -
Nilanjal Misra,
Ashok K. Yadav,
Sangita Dhara,
Nigamananda Mishra,
Rohan Phatak,
A.K. Poswal,
S. N. Jha,
A. K. Sinha,
D. Bhattacharyya
Publication year - 2013
Publication title -
analytical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 73
eISSN - 1348-2246
pISSN - 0910-6340
DOI - 10.2116/analsci.29.579
Subject(s) - chemistry , characterization (materials science) , x ray , x ray absorption spectroscopy , x ray crystallography , analytical chemistry (journal) , doping , diffraction , spectroscopy , absorption (acoustics) , absorption spectroscopy , crystallography , optics , environmental chemistry , optoelectronics , quantum mechanics , physics
The preparation and characterization of Sb-doped Bi(2)UO(6) solid solutions, in a limited composition range, is reported for the first time. The solid solutions were prepared by solid-state reactions of Bi(2)O(3), Sb(2)O(3) and U(3)O(8) in the required stoichiometry. The reaction products were characterized by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) measurements at the Bi and U L(3) edges. The XRD patterns indicate the precipitation of additional phases in the samples when Sb doping exceeds 4 at%. The chemical shifts of the Bi absorption edges in the samples, determined from the XANES spectra, show a systematic variation only up to 4 at% of Sb doping and support the results of XRD measurements. These observations are further supported by the local structure parameters obtained by analysis of the EXAFS spectra. The local structure of U is found to remain unchanged upon Sb doping indicating that Sb(+3) ions replace Bi(+3) during the doping of Bi(2)UO(6) by Sb.