Lattice contraction and lattice deformation of UO2 and ThO2 doped with Gd2O3

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Lattice contraction and lattice deformation of UO2 and ThO2 doped with Gd2O3. / Baena, Angela; Cardinaels, Thomas; Govers, Kevin; Pakarinen, Janne; Verwerft, Marc; Binnemans, Koen.

In: Journal of Nuclear Materials, Vol. 467, No. 1, 14.09.2015, p. 135-143.

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@article{880dad4ec7ac4ee7bb32ff21c0f0d2aa,
title = "Lattice contraction and lattice deformation of UO2 and ThO2 doped with Gd2O3",
abstract = "{"}The lattice deformations in two doped fluorite systems, (U1-xGdx)O2.00 and (Th1‑xGdx)O2-x/2, have been reassessed by precise X-ray and electron diffraction investigations and the results were interpreted using the Bond Valence Sum (BVS) approach. For the (U1-xGdx)O2.00 system, the experimental findings and theoretical assessment confirm earlier work: the lattice keeps its fluorite structure with a unit cell parameter that contracts linearly with dopant concentration. The lattice contraction in the (Th1‑xGdx)O2-x/2 system has for the first time been analyzed up to the solubility limit. Similar as for (U1-xGdx)O2.00, the (Th1‑xGdx)O2-x/2 solid solution contracts linearly as a function of dopant concentration but additionally, it develops a superstructure which is closely related to the parent fluorite structure. An excess anion bixbyite trial model is proposed to describe this superstructure.{"}",
keywords = "Condensed matter, Uranium dioxide, Thorium dioxide, Gadolinium sesquioxide, Solid solutions, UO2-Gd2O3, ThO2-Gd2O3, X-ray diffraction, Electron diffraction, Diffuse scattering, Structure defects, Fluorite, Bixbyite, Bond Valence Sum",
author = "Angela Baena and Thomas Cardinaels and Kevin Govers and Janne Pakarinen and Marc Verwerft and Koen Binnemans",
note = "Score=10",
year = "2015",
month = "9",
day = "14",
doi = "10.1016/j.jnucmat.2015.09.018",
language = "English",
volume = "467",
pages = "135--143",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",
number = "1",

}

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TY - JOUR

T1 - Lattice contraction and lattice deformation of UO2 and ThO2 doped with Gd2O3

AU - Baena, Angela

AU - Cardinaels, Thomas

AU - Govers, Kevin

AU - Pakarinen, Janne

AU - Verwerft, Marc

AU - Binnemans, Koen

N1 - Score=10

PY - 2015/9/14

Y1 - 2015/9/14

N2 - "The lattice deformations in two doped fluorite systems, (U1-xGdx)O2.00 and (Th1‑xGdx)O2-x/2, have been reassessed by precise X-ray and electron diffraction investigations and the results were interpreted using the Bond Valence Sum (BVS) approach. For the (U1-xGdx)O2.00 system, the experimental findings and theoretical assessment confirm earlier work: the lattice keeps its fluorite structure with a unit cell parameter that contracts linearly with dopant concentration. The lattice contraction in the (Th1‑xGdx)O2-x/2 system has for the first time been analyzed up to the solubility limit. Similar as for (U1-xGdx)O2.00, the (Th1‑xGdx)O2-x/2 solid solution contracts linearly as a function of dopant concentration but additionally, it develops a superstructure which is closely related to the parent fluorite structure. An excess anion bixbyite trial model is proposed to describe this superstructure."

AB - "The lattice deformations in two doped fluorite systems, (U1-xGdx)O2.00 and (Th1‑xGdx)O2-x/2, have been reassessed by precise X-ray and electron diffraction investigations and the results were interpreted using the Bond Valence Sum (BVS) approach. For the (U1-xGdx)O2.00 system, the experimental findings and theoretical assessment confirm earlier work: the lattice keeps its fluorite structure with a unit cell parameter that contracts linearly with dopant concentration. The lattice contraction in the (Th1‑xGdx)O2-x/2 system has for the first time been analyzed up to the solubility limit. Similar as for (U1-xGdx)O2.00, the (Th1‑xGdx)O2-x/2 solid solution contracts linearly as a function of dopant concentration but additionally, it develops a superstructure which is closely related to the parent fluorite structure. An excess anion bixbyite trial model is proposed to describe this superstructure."

KW - Condensed matter

KW - Uranium dioxide

KW - Thorium dioxide

KW - Gadolinium sesquioxide

KW - Solid solutions

KW - UO2-Gd2O3

KW - ThO2-Gd2O3

KW - X-ray diffraction

KW - Electron diffraction

KW - Diffuse scattering

KW - Structure defects

KW - Fluorite

KW - Bixbyite

KW - Bond Valence Sum

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/12736959

U2 - 10.1016/j.jnucmat.2015.09.018

DO - 10.1016/j.jnucmat.2015.09.018

M3 - Article

VL - 467

SP - 135

EP - 143

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - 1

ER -

ID: 1128620