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Characterization and thermomechanical properties of Ln2Zr2O7 (Ln=La, Pr, Nd, Eu, Gd, Dy) and Nd2Ce2O7

Published online by Cambridge University Press:  21 February 2013

Toshiaki Kawano ,
Hiroaki Muta ,
Masayoshi Uno ,
Yuji Ohishi ,
Ken Kurosaki  and
Shinsuke Yamanaka
Toshiaki Kawano
Affiliation:
Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Hiroaki Muta
Affiliation:
Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Masayoshi Uno
Affiliation:
Research Institute of Nuclear Engineering, Fukui University, Bunkyo 3-9-1, Fukui-shi, Fukui 910-8507, Japan
Yuji Ohishi
Affiliation:
Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Ken Kurosaki
Affiliation:
Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Shinsuke Yamanaka
Affiliation:
Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan Research Institute of Nuclear Engineering, Fukui University, Bunkyo 3-9-1, Fukui-shi, Fukui 910-8507, Japan
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Abstract

Pyrochlore type compound Nd2(Zr,Ce)2O7 is considered to precipitate in ThO2-based fuel, that is not observed in irradiated UO2. In order to evaluate the influences on fuel properties, thermomechanical properties of the pyrochlore type compounds, Ln2Zr2O7 (Ln=La, Pr, Nd, Eu, Gd, Dy) and Nd2Ce2O7 were investigated. We synthesized the samples by solid-state reaction and pelletized by spark plasma sintering to make high density (≥ 90 %T.D.) pellets. The phase states and lattice parameters were examined by using X-ray diffraction and SEM/EDX analysis. The lattice parameters of Ln2Zr2O7 depended on the ionic radii of lanthanide ions. The heat capacity, thermal conductivity, linear thermal expansion coefficient, and elastic constants were also measured. It was confirmed that the thermal conductivities for Ln2Zr2O7 were lower than that for ThO2 and depended on Ln ionic radii. The values of elastic constants tended to increase with increasing the Ln ionic radii, corresponding to the thermal conductivity.

Keywords

nuclear materialsthermal conductivityelastic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1514: Symposium HH – Advances in Materials for Nuclear Energy , 2013 , pp. 139 - 144
Copyright
Copyright © Materials Research Society 2013 

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