Incorporation of Cerium and Neodymium in Uranyl Phases

Cheol-Woon Kim; David J. Wronkiewicz; Robert J. Finch; Edgar C. Buck

doi:10.1016/j.jnucmat.2006.02.087

Incorporation of Cerium and Neodymium in Uranyl Phases

Cheol-Woon Kim
, David J. Wronkiewicz
, Robert J. Finch
, Edgar C. Buck

Research output: Contribution to journal › Article › peer-review

Abstract

The potential for incorporating rare earth elements (REE) into/onto crystalline compounds has been evaluated by precipitating uranyl phases from aqueous solutions containing either cerium or neodymium. These REEs serve both as monitors for evaluating the potential repository behavior of REE radionuclides, and as surrogate elements for actinides (e.g., Ce ⁴⁺ and Nd ³⁺ for Pu ⁴⁺ and Am ³⁺ , respectively). The present experiments examined the behavior of REE in the presence of ianthinite ([U ₂ ⁴⁺ (UO ₂ ) ₄ O ₆ (OH) ₄ (H ₂ O) ₄ ] (H ₂ O) ₅ ), becquerelite (Ca(UO ₂ ) ₆ O ₄ (OH) ₆ (H ₂ O) ₈ ), and other uranyl hydroxide compounds commonly noted as alteration products during the corrosion of UO ₂ , spent nuclear fuel, and naturally occurring uraninite. The results of these experiments demonstrate that significant quantities of both cerium (K _d = 1020) and neodymium (K _d = 840) are incorporated within the uranium alteration phases and suggest that ionic substitution and/or adsorption to the uranyl phases can play a key role in the limiting the mobility of REE (and by analogy, actinide elements) in a nuclear waste repository.

Original language	American English
Pages (from-to)	147-157
Number of pages	11
Journal	Journal of Nuclear Materials
Volume	353
Issue number	3
DOIs	https://doi.org/10.1016/j.jnucmat.2006.02.087
State	Published - Jul 1 2006

Keywords

Crystalline Compounds
Precipitating Uranyl Phases
Rare earth metals

Disciplines

Geology
Nuclear Engineering

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10.1016/j.jnucmat.2006.02.087License: CC BY

https://doi.org/10.1016/j.jnucmat.2006.02.087

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title = "Incorporation of Cerium and Neodymium in Uranyl Phases",

abstract = " The potential for incorporating rare earth elements (REE) into/onto crystalline compounds has been evaluated by precipitating uranyl phases from aqueous solutions containing either cerium or neodymium. These REEs serve both as monitors for evaluating the potential repository behavior of REE radionuclides, and as surrogate elements for actinides (e.g., Ce 4+ and Nd 3+ for Pu 4+ and Am 3+ , respectively). The present experiments examined the behavior of REE in the presence of ianthinite ([U 2 4+ (UO 2 ) 4 O 6 (OH) 4 (H 2 O) 4 ] (H 2 O) 5 ), becquerelite (Ca(UO 2 ) 6 O 4 (OH) 6 (H 2 O) 8 ), and other uranyl hydroxide compounds commonly noted as alteration products during the corrosion of UO 2 , spent nuclear fuel, and naturally occurring uraninite. The results of these experiments demonstrate that significant quantities of both cerium (K d = 1020) and neodymium (K d = 840) are incorporated within the uranium alteration phases and suggest that ionic substitution and/or adsorption to the uranyl phases can play a key role in the limiting the mobility of REE (and by analogy, actinide elements) in a nuclear waste repository.",

keywords = "Crystalline Compounds, Precipitating Uranyl Phases, Rare earth metals",

author = "Cheol-Woon Kim and Wronkiewicz, \{David J.\} and Finch, \{Robert J.\} and Buck, \{Edgar C.\}",

year = "2006",

month = jul,

day = "1",

doi = "10.1016/j.jnucmat.2006.02.087",

language = "American English",

volume = "353",

pages = "147--157",

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T1 - Incorporation of Cerium and Neodymium in Uranyl Phases

AU - Kim, Cheol-Woon

AU - Wronkiewicz, David J.

AU - Finch, Robert J.

AU - Buck, Edgar C.

PY - 2006/7/1

Y1 - 2006/7/1

N2 - The potential for incorporating rare earth elements (REE) into/onto crystalline compounds has been evaluated by precipitating uranyl phases from aqueous solutions containing either cerium or neodymium. These REEs serve both as monitors for evaluating the potential repository behavior of REE radionuclides, and as surrogate elements for actinides (e.g., Ce 4+ and Nd 3+ for Pu 4+ and Am 3+ , respectively). The present experiments examined the behavior of REE in the presence of ianthinite ([U 2 4+ (UO 2 ) 4 O 6 (OH) 4 (H 2 O) 4 ] (H 2 O) 5 ), becquerelite (Ca(UO 2 ) 6 O 4 (OH) 6 (H 2 O) 8 ), and other uranyl hydroxide compounds commonly noted as alteration products during the corrosion of UO 2 , spent nuclear fuel, and naturally occurring uraninite. The results of these experiments demonstrate that significant quantities of both cerium (K d = 1020) and neodymium (K d = 840) are incorporated within the uranium alteration phases and suggest that ionic substitution and/or adsorption to the uranyl phases can play a key role in the limiting the mobility of REE (and by analogy, actinide elements) in a nuclear waste repository.

AB - The potential for incorporating rare earth elements (REE) into/onto crystalline compounds has been evaluated by precipitating uranyl phases from aqueous solutions containing either cerium or neodymium. These REEs serve both as monitors for evaluating the potential repository behavior of REE radionuclides, and as surrogate elements for actinides (e.g., Ce 4+ and Nd 3+ for Pu 4+ and Am 3+ , respectively). The present experiments examined the behavior of REE in the presence of ianthinite ([U 2 4+ (UO 2 ) 4 O 6 (OH) 4 (H 2 O) 4 ] (H 2 O) 5 ), becquerelite (Ca(UO 2 ) 6 O 4 (OH) 6 (H 2 O) 8 ), and other uranyl hydroxide compounds commonly noted as alteration products during the corrosion of UO 2 , spent nuclear fuel, and naturally occurring uraninite. The results of these experiments demonstrate that significant quantities of both cerium (K d = 1020) and neodymium (K d = 840) are incorporated within the uranium alteration phases and suggest that ionic substitution and/or adsorption to the uranyl phases can play a key role in the limiting the mobility of REE (and by analogy, actinide elements) in a nuclear waste repository.

KW - Crystalline Compounds

KW - Precipitating Uranyl Phases

KW - Rare earth metals

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DO - 10.1016/j.jnucmat.2006.02.087

M3 - Article

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EP - 157

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 3

ER -

Incorporation of Cerium and Neodymium in Uranyl Phases

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