Anisotropy in the thermal expansion of uranium silicide measured by neutron diffraction

E. G. Obbard; K. D. Johnson; P. A. Burr; D. A. Lopes; D. J. Gregg; K. D. Liss; G. Griffiths; N. Scales; S. C. Middleburgh

doi:10.1016/j.jnucmat.2018.04.049

Anisotropy in the thermal expansion of uranium silicide measured by neutron diffraction

E. G. Obbard
, K. D. Johnson
, P. A. Burr
, D. A. Lopes
, D. J. Gregg
, K. D. Liss
, G. Griffiths
, N. Scales
, S. C. Middleburgh

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

19 Scopus citations

Abstract

In-situ neutron diffraction patterns were collected for a sample of as-cast U₃Si₂ during heating to 1600 °C. Anomalous changes were observed above 1000 °C, including the formation of a new diffraction peak not belonging to P4/mbm U₃Si₂, unequal changes in the peak intensities and onset of anisotropic lattice expansion. The large data-set enabled derivation of a function-fitted isotropic thermal expansion coefficient to high precision, in close agreement with previous dilatometry results but reducing linearly with temperature over the studied interval. Anisotropy in the instantaneous lattice thermal expansion corresponded to anomalies reported by White et al. (2015) at a similar temperature.

Original language	English
Pages (from-to)	516-520
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	508
DOIs	https://doi.org/10.1016/j.jnucmat.2018.04.049
State	Published - Sep 2018
Externally published	Yes

Funding

We are grateful to the Sample Environment team at the Australian Centre for Neutron Scattering, the ANSTO Nuclear Stewardship research group, and laboratory scientists and administrative staff in the Department of Reactor Physics, KTH. This work was carried out as part of the Westinghouse CARAT collaborative project on accident tolerant fuels. PAB and EO acknowledge charitable financial support of ANSTO and the Tyree Foundation . We are grateful to the Sample Environment team at the Australian Centre for Neutron Scattering, the ANSTO Nuclear Stewardship research group, and laboratory scientists and administrative staff in the Department of Reactor Physics, KTH. This work was carried out as part of the Westinghouse CARAT collaborative project on accident tolerant fuels. PAB and EO acknowledge charitable financial support of ANSTO and the Tyree Foundation.

Keywords

Accident tolerant fuel
In-situ neutron diffraction
Phase transformation
Thermal expansion
Uranium silicide

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10.1016/j.jnucmat.2018.04.049

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@article{d8550968749249d88801028797ee4619,

title = "Anisotropy in the thermal expansion of uranium silicide measured by neutron diffraction",

abstract = "In-situ neutron diffraction patterns were collected for a sample of as-cast U3Si2 during heating to 1600 °C. Anomalous changes were observed above 1000 °C, including the formation of a new diffraction peak not belonging to P4/mbm U3Si2, unequal changes in the peak intensities and onset of anisotropic lattice expansion. The large data-set enabled derivation of a function-fitted isotropic thermal expansion coefficient to high precision, in close agreement with previous dilatometry results but reducing linearly with temperature over the studied interval. Anisotropy in the instantaneous lattice thermal expansion corresponded to anomalies reported by White et al. (2015) at a similar temperature.",

keywords = "Accident tolerant fuel, In-situ neutron diffraction, Phase transformation, Thermal expansion, Uranium silicide",

author = "Obbard, \{E. G.\} and Johnson, \{K. D.\} and Burr, \{P. A.\} and Lopes, \{D. A.\} and Gregg, \{D. J.\} and Liss, \{K. D.\} and G. Griffiths and N. Scales and Middleburgh, \{S. C.\}",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = sep,

doi = "10.1016/j.jnucmat.2018.04.049",

language = "English",

volume = "508",

pages = "516--520",

journal = "Journal of Nuclear Materials",

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TY - JOUR

T1 - Anisotropy in the thermal expansion of uranium silicide measured by neutron diffraction

AU - Obbard, E. G.

AU - Johnson, K. D.

AU - Burr, P. A.

AU - Lopes, D. A.

AU - Gregg, D. J.

AU - Liss, K. D.

AU - Griffiths, G.

AU - Scales, N.

AU - Middleburgh, S. C.

PY - 2018/9

Y1 - 2018/9

N2 - In-situ neutron diffraction patterns were collected for a sample of as-cast U3Si2 during heating to 1600 °C. Anomalous changes were observed above 1000 °C, including the formation of a new diffraction peak not belonging to P4/mbm U3Si2, unequal changes in the peak intensities and onset of anisotropic lattice expansion. The large data-set enabled derivation of a function-fitted isotropic thermal expansion coefficient to high precision, in close agreement with previous dilatometry results but reducing linearly with temperature over the studied interval. Anisotropy in the instantaneous lattice thermal expansion corresponded to anomalies reported by White et al. (2015) at a similar temperature.

AB - In-situ neutron diffraction patterns were collected for a sample of as-cast U3Si2 during heating to 1600 °C. Anomalous changes were observed above 1000 °C, including the formation of a new diffraction peak not belonging to P4/mbm U3Si2, unequal changes in the peak intensities and onset of anisotropic lattice expansion. The large data-set enabled derivation of a function-fitted isotropic thermal expansion coefficient to high precision, in close agreement with previous dilatometry results but reducing linearly with temperature over the studied interval. Anisotropy in the instantaneous lattice thermal expansion corresponded to anomalies reported by White et al. (2015) at a similar temperature.

KW - Accident tolerant fuel

KW - In-situ neutron diffraction

KW - Phase transformation

KW - Thermal expansion

KW - Uranium silicide

UR - https://www.scopus.com/pages/publications/85048301414

U2 - 10.1016/j.jnucmat.2018.04.049

DO - 10.1016/j.jnucmat.2018.04.049

M3 - Article

AN - SCOPUS:85048301414

SN - 0022-3115

VL - 508

SP - 516

EP - 520

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Anisotropy in the thermal expansion of uranium silicide measured by neutron diffraction

Abstract

Funding

Keywords

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