Hostname: page-component-cc8bf7c57-77pjf Total loading time: 0 Render date: 2024-12-11T02:43:31.599Z Has data issue: false hasContentIssue false

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
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
Get access

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.

Type
Articles
Copyright
Copyright © Materials Research Society 2013 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Potential of thorium based fuel cycles to constrain plutonium and reduce long lived waste toxicity, IAEA-TECDOC-1349, (2003).Google Scholar
Thorium fuel cycle – Potential benefits and challenges, IAEA-TECDOC-1450, (2005).Google Scholar
Ugajin, M. and Shiba, K., J. Nucl. Mater. 105, 211 (1982).10.1016/0022-3115(82)90376-2CrossRefGoogle Scholar
Shimamura, K., Arima, T., Idematsu, K., Inagaki, Y., Int. J. Thermophys, 28, 1074 (2007).10.1007/s10765-007-0232-9CrossRefGoogle Scholar
Galasso, Francis S., “Structure and Properties of Inorganic Solids”, Pergamon Press, 1970.Google Scholar
Nishino, H., Matsunaga, N., Kakinuma, K., Yamamura, H. and Nomura, K., J. Ceram. Soc. Jpn Supplement 112-1 PacRim5 Special Issue, 112[5], S738 (2004).Google Scholar
Shannon, R. D., Acta. Cryst., A32, 751 (1976).10.1107/S0567739476001551CrossRefGoogle Scholar
Zhou, Hongming, Yi, Danqing, Yu, Zhiming, Xiao, Lairong, J. Alloys Compd, 438, 217 (2007).10.1016/j.jallcom.2006.08.005CrossRefGoogle Scholar
Fu-kang, F., Kuznetssov, A. K. and Keler, E. K., Bull. Acad. Sci. (USSR) Div. Chem. Soc., 4, 573 (1965).10.1007/BF00846706CrossRefGoogle Scholar
Sattonnay, G., Moll, S., Thome, L., Legros, C., Calvo, A., Herbst-Ghysel, M., Decorse, C. and Monnet, I., Nucl. Instrum. Method, 272, 261 (2012).10.1016/j.nimb.2011.01.079CrossRefGoogle Scholar
Lutique, S., Konings, R.J.M., Rondinella, V.V., Somers, J., Wiss, T., J. Alloys Compd, 352, 1 (2003).10.1016/S0925-8388(02)01113-1CrossRefGoogle Scholar
SGTE Pure Substance and Solution Databases, GTT-DATA SERVICE (1996).Google Scholar
Rice, “Porosity of ceramics”, Marcel Dekker Inc., New York USA (1998).Google Scholar
Subramanian, M.A., Aravamudan, G., Rao, G.V.S., Prog. Solid State Chem., 15, 55 (1983).10.1016/0079-6786(83)90001-8CrossRefGoogle Scholar
Slack, G. A. in Solid State Physics, edited by Seitz, F., Turnbull, D., and Ehrenreich, H. (Academic, New York, 1979), Vol. 34, pp. 171.Google Scholar