Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses

Abstract Borosilicate glasses will be used to stabilize the high-level radioactive wastes for disposal in a geological repository. Understanding the effects of actinide addition to a borosilicate glass matrix is of great importance in view of waste immobilization. Lanthanides were considered as chem...

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Autores principales:	M. Fabian, F. Pinakidou, I. Tolnai, O. Czompoly, J. Osan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ea719415992a42c4b8ef9f46b0ee0eb8
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spelling	oai:doaj.org-article:ea719415992a42c4b8ef9f46b0ee0eb82021-12-02T16:07:03ZLanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses10.1038/s41598-021-92777-w2045-2322https://doaj.org/article/ea719415992a42c4b8ef9f46b0ee0eb82021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92777-whttps://doaj.org/toc/2045-2322Abstract Borosilicate glasses will be used to stabilize the high-level radioactive wastes for disposal in a geological repository. Understanding the effects of actinide addition to a borosilicate glass matrix is of great importance in view of waste immobilization. Lanthanides were considered as chemical surrogates for actinides. The local structures of Ce3+, Nd3+ and Eu3+ ions in borosilicate glass, have been investigated by synchrotron radiation based techniques. The atomic parameters, such as bond lengths and coordination environments derived from X-ray diffraction, in combined with Reverse Monte Carlo simulations show correlation with X-ray absorption fine structure data. The lanthanide ions are in the common network with the tetrahedral SiO4 and with the mixed trigonal BO3 and tetrahedral BO4 units. Second neighbor atomic pair correlations reveal that the Ce3+, Nd3+ and Eu3+ ions are accommodated in both Si and B sites, supporting that the lanthanide-ions are stabilized in the glass-matrix network. Microscopy and microanalysis provided information on the amorphous state and on the major elemental composition of the high lanthanide-concentration samples. The release of matrix components (Si, B, Na, Ba, Zr) is higher than that of lanthanides (Ce, Nd, Eu). Both types of elements show a decreasing release tendency with time.M. FabianF. PinakidouI. TolnaiO. CzompolyJ. OsanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Fabian F. Pinakidou I. Tolnai O. Czompoly J. Osan Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses
description	Abstract Borosilicate glasses will be used to stabilize the high-level radioactive wastes for disposal in a geological repository. Understanding the effects of actinide addition to a borosilicate glass matrix is of great importance in view of waste immobilization. Lanthanides were considered as chemical surrogates for actinides. The local structures of Ce3+, Nd3+ and Eu3+ ions in borosilicate glass, have been investigated by synchrotron radiation based techniques. The atomic parameters, such as bond lengths and coordination environments derived from X-ray diffraction, in combined with Reverse Monte Carlo simulations show correlation with X-ray absorption fine structure data. The lanthanide ions are in the common network with the tetrahedral SiO4 and with the mixed trigonal BO3 and tetrahedral BO4 units. Second neighbor atomic pair correlations reveal that the Ce3+, Nd3+ and Eu3+ ions are accommodated in both Si and B sites, supporting that the lanthanide-ions are stabilized in the glass-matrix network. Microscopy and microanalysis provided information on the amorphous state and on the major elemental composition of the high lanthanide-concentration samples. The release of matrix components (Si, B, Na, Ba, Zr) is higher than that of lanthanides (Ce, Nd, Eu). Both types of elements show a decreasing release tendency with time.
format	article
author	M. Fabian F. Pinakidou I. Tolnai O. Czompoly J. Osan
author_facet	M. Fabian F. Pinakidou I. Tolnai O. Czompoly J. Osan
author_sort	M. Fabian
title	Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses
title_short	Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses
title_full	Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses
title_fullStr	Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses
title_full_unstemmed	Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses
title_sort	lanthanide (ce, nd, eu) environments and leaching behavior in borosilicate glasses
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ea719415992a42c4b8ef9f46b0ee0eb8
work_keys_str_mv	AT mfabian lanthanidecendeuenvironmentsandleachingbehaviorinborosilicateglasses AT fpinakidou lanthanidecendeuenvironmentsandleachingbehaviorinborosilicateglasses AT itolnai lanthanidecendeuenvironmentsandleachingbehaviorinborosilicateglasses AT oczompoly lanthanidecendeuenvironmentsandleachingbehaviorinborosilicateglasses AT josan lanthanidecendeuenvironmentsandleachingbehaviorinborosilicateglasses
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Lanthanide (Ce, Nd, Eu) environments and leaching behavior in borosilicate glasses

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