Imperial College London
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ProfessorRobinGrimes

Faculty of Engineering, Department of Materials

BCH Steele Chair in Energy Materials
 
 
 
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Contact

 

+44 (0)20 7594 6730r.grimes

 
 
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Location

 

B303cBessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pavlov:2018:10.1038/s41598-018-21406-w,
author = {Pavlov, TR and Wangle, T and Wenman, MR and Tyrpekl, V and Vlahovic, L and Robba, D and Van, Uffelen P and Konings, RJM and Grimes, RW},
doi = {10.1038/s41598-018-21406-w},
journal = {SCIENTIFIC REPORTS},
title = {High temperature measurements and condensed matter analysis of the thermo-physical properties of ThO2},
url = {http://dx.doi.org/10.1038/s41598-018-21406-w},
volume = {8},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Values are presented for thermal conductivity, specific heat, spectral and total hemispherical emissivity of ThO2 (a potential nuclear fuel material) in a temperature range representative of a nuclear accident - 2000 K to 3050 K. For the first time direct measurements of thermal conductivity have been carried out on ThO2 at such high temperatures, clearly showing the property does not decrease above 2000 K. This could be understood in terms of an electronic contribution (arising from defect induced donor/acceptor states) compensating the degradation of lattice thermal conductivity. The increase in total hemispherical emissivity and visible/near-infrared spectral emissivity is consistent with the formation of donor/acceptor states in the band gap of ThO2. The electronic population of these defect states increases with temperature and hence more incoming photons (in the visible and near-infrared wavelength range) can be absorbed. A solid state physics model is used to interpret the experimental results. Specific heat and thermal expansion coefficient increase at high temperatures due to the formation of defects, in particular oxygen Frenkel pairs. Prior to melting a gradual increase to a maximum value is predicted in both properties. These maxima mark the onset of saturation of oxygen interstitial sites.
AU  - Pavlov,TR
AU  - Wangle,T
AU  - Wenman,MR
AU  - Tyrpekl,V
AU  - Vlahovic,L
AU  - Robba,D
AU  - Van,Uffelen P
AU  - Konings,RJM
AU  - Grimes,RW
DO  - 10.1038/s41598-018-21406-w
PY  - 2018///
SN  - 2045-2322
TI  - High temperature measurements and condensed matter analysis of the thermo-physical properties of ThO2
T2  - SCIENTIFIC REPORTS
UR  - http://dx.doi.org/10.1038/s41598-018-21406-w
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000428033500006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/58740
VL  - 8
ER  -
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