Localization of uranium in radiation-damaged nanoheterogeneous natural zircon

Autor:	E. V. Shalaeva, Yu. V. Shchapova, A. M. Murzakaev, V. V. Makarov, D. A. Zamyatin, S. L. Votyakov, V. G. Pushin
Rok vydání:	2015
Předmět:	Zirconium Materials science Analytical chemistry chemistry.chemical_element Uranium Condensed Matter Physics Nanocrystalline material Hydrothermal circulation chemistry Impurity Transmission electron microscopy Materials Chemistry Ceramics and Composites Silicon oxide Zircon Nuclear chemistry
Zdroj:	Glass Physics and Chemistry. 41:389-397
ISSN:	1608-313X 1087-6596
DOI:	10.1134/s1087659615040136
Popis:	High-uranium natural zircon with signs of hydrothermal (up to 300°C) treatment is studied via transmission electron microscopy, Raman spectroscopy, electron probe microanalysis, and local energy-dispersive analysis performed in situ with a transmission electron microscope. Uranium-based phases are not found in the regions with uranium concentrations of up to 10 wt % that exceed considerably the limit of solubility in synthetic zirconium silicate. Uranium is dissolved in a heterogeneous matrix that is formed as a result of the decomposition of radiation-damaged (a dose of 1017 α-decays/mg) zircon under hydrothermal influence. The matrix incorporates amorphous partially hydrated silicon oxide and nanocrystalline cubic (Zr,Hf)1-y MeyO2 stabilized with metal Me impurities (Y, Ca, Al, Fe; y ≈ 0.04). Cubic zirconium oxide is regarded as the preferred phase for uranium localization, while the total impurity concentration is ~0.13.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f2e83b124ac7f6d79d1e64ebd0e48e91 https://doi.org/10.1134/s1087659615040136 Zobrazit plný text záznamu Full text from SpringerLink