Charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 studied by X-ray Absorption Spectroscopy

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Charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 studied by X-ray Absorption Spectroscopy. / Bes, Rene; Pakarinen, Janne; Baena, Angela; Conradson, Steven; Verwerft, Marc; Tuomisto, Filip.

In: Journal of Nuclear Materials, Vol. 489, 29.03.2017, p. 9-21.

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Bes, Rene ; Pakarinen, Janne ; Baena, Angela ; Conradson, Steven ; Verwerft, Marc ; Tuomisto, Filip. / Charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 studied by X-ray Absorption Spectroscopy. In: Journal of Nuclear Materials. 2017 ; Vol. 489. pp. 9-21.

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@article{ef987b77d1324b3cb80a65b55bb635c8,
title = "Charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 studied by X-ray Absorption Spectroscopy",
abstract = "The charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 have been systematically studied using X-ray Absorption Spectroscopy (XAS) upon gradually increasing the Gd content. Our XAS results for a series of technologically relevant Gd contents in U1-xGdxO2 clearly demonstrate that upon increasing the Gd content U5+ is formed inducing slight increase in the U coordination number and contraction for the U-O distances while the Gd local environment remains virtually unchanged. For the Th1-xGdxO2-x/2 larger Gd fractions were applied (x ¼ 0.10 to 0.34). Nonetheless, both Gd and Th local environments show changes upon increasing the Gd content; the average Gd-O and Th-O distances decrease gradually and the Gd and Th coordination numbers follow the expected trend considering the O vacancy formation to obtain charge neutrality.",
keywords = "UO2, Gd, Charge compensation, XANES, EXAFS",
author = "Rene Bes and Janne Pakarinen and Angela Baena and Steven Conradson and Marc Verwerft and Filip Tuomisto",
note = "Score=10",
year = "2017",
month = "3",
day = "29",
doi = "10.1016/j.jnucmat.2017.03.042",
language = "English",
volume = "489",
pages = "9--21",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 studied by X-ray Absorption Spectroscopy

AU - Bes, Rene

AU - Pakarinen, Janne

AU - Baena, Angela

AU - Conradson, Steven

AU - Verwerft, Marc

AU - Tuomisto, Filip

N1 - Score=10

PY - 2017/3/29

Y1 - 2017/3/29

N2 - The charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 have been systematically studied using X-ray Absorption Spectroscopy (XAS) upon gradually increasing the Gd content. Our XAS results for a series of technologically relevant Gd contents in U1-xGdxO2 clearly demonstrate that upon increasing the Gd content U5+ is formed inducing slight increase in the U coordination number and contraction for the U-O distances while the Gd local environment remains virtually unchanged. For the Th1-xGdxO2-x/2 larger Gd fractions were applied (x ¼ 0.10 to 0.34). Nonetheless, both Gd and Th local environments show changes upon increasing the Gd content; the average Gd-O and Th-O distances decrease gradually and the Gd and Th coordination numbers follow the expected trend considering the O vacancy formation to obtain charge neutrality.

AB - The charge compensation mechanisms in U1-xGdxO2 and Th1-xGdxO2-x/2 have been systematically studied using X-ray Absorption Spectroscopy (XAS) upon gradually increasing the Gd content. Our XAS results for a series of technologically relevant Gd contents in U1-xGdxO2 clearly demonstrate that upon increasing the Gd content U5+ is formed inducing slight increase in the U coordination number and contraction for the U-O distances while the Gd local environment remains virtually unchanged. For the Th1-xGdxO2-x/2 larger Gd fractions were applied (x ¼ 0.10 to 0.34). Nonetheless, both Gd and Th local environments show changes upon increasing the Gd content; the average Gd-O and Th-O distances decrease gradually and the Gd and Th coordination numbers follow the expected trend considering the O vacancy formation to obtain charge neutrality.

KW - UO2

KW - Gd

KW - Charge compensation

KW - XANES

KW - EXAFS

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/23018985

U2 - 10.1016/j.jnucmat.2017.03.042

DO - 10.1016/j.jnucmat.2017.03.042

M3 - Article

VL - 489

SP - 9

EP - 21

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -

ID: 2352770