Hydrolysis of uranium and thorium in surface-modified bentonite under hydrothermal conditions

Autor:	L. Soderholm, S.E. Yuchs, D.M. Giaquinta, S.R. Wasserman
Rok vydání:	1997
Předmět:	X-ray absorption spectroscopy Silanes Absorption spectroscopy Mechanical Engineering Metals and Alloys Thorium chemistry.chemical_element Uranium Fluorite Hydrothermal circulation chemistry.chemical_compound chemistry Mechanics of Materials Bentonite Materials Chemistry Nuclear chemistry
Zdroj:	Journal of Alloys and Compounds. 249:142-145
ISSN:	0925-8388
DOI:	10.1016/s0925-8388(96)02823-x
Popis:	The speciation of (UO 2 ) 2+ - and Th 4+ -exchanged bentonite clay samples was probed by X-ray absorption spectroscopy (XAS). Surface modification reactions using hydrophobic silanes were performed in order to ascertain the effects of excluding the free exchange of external water from the clay gallery. Hydrothermal conditions were used to mimic potential geologic conditions in a nuclear waste storage facility. Both the (UO 2 ) 2+ and Th 4+ samples showed evidence of polymeric hydrolysis products similar to the fluorite structure known for both UO 2 and ThO 2 .
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ed059658a242c5d48d34ecca44fec0d6 https://doi.org/10.1016/s0925-8388(96)02823-x Zobrazit plný text záznamu Full Text from ScienceDirect