Journal of Radioanalytical and Nuclear Chemistry

, Volume 314, Issue 2, pp 1405–1416 | Cite as

Synthesis and study of hexauranates MIII[(UO2)6O4.5(OH)6]·7H2O (MIII—Nd, Sm, Eu, Gd, Dy)

  • Oxana V. Nipruk
  • Nikolay G. Chernorukov
  • Кseniya A. Chaplieva
Article
  • 46 Downloads

Abstract

Previously unknown hexauranates MIII[(UO2)6O4.5(OH)6]·7H2O (MIII—Nd, Sm, Eu, Gd, Dy) were obtained by reaction of UO3·2.25H2O with aqueous solutions of MIII(NO3)3 under hydrothermal conditions at 200 °C. Composition and structure of these compounds were defined, processes of dehydration and thermal decomposition were studied, the state in aqueous solutions was investigated. Solubility data were used for calculation of solubility products and standard formation Gibbs functions of MIII[(UO2)6O4.5(OH)6]·7H2O. The theoretical solubility curves of studied compounds depending on pH were calculated, U(VI) and M(III) speciation diagrams both in aqueous solutions and equilibrium solid phases were plotted.

Keywords

Uranates Rare earth elements X-ray diffraction Thermal analysis IR-spectroscopy Solubility 

Notes

Acknowledgements

The authors gratefully acknowledge to the Ministry of Education and Science of the Russian Federation for the financial support in the framework of the Basic part of State Program [Grant Number No 4.5706.2017/BP].

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2017

Authors and Affiliations

  1. 1.Lobachevsky State University of Nizhni NovgorodNizhny NovgorodRussian Federation

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