Local-structure of Gd $_{2}$ Zr $_{2}$ O $_{7}$ and Gd $_{2}$ Ti $_{2}$ O $_{7}$ probed by EXAFS and $^{155}$ Gd-Moessbauer methods

Okamoto, Yoshihiro ; Fuentes, A.*; Takahashi, Masashi*; Takeda, Masuo*; Nakamura, Akio

Pyrochlore (P) Gd $_{2}$ Zr $_{2}$ O $_{2}$ has recently revived significant research interest due to its superior radiation tolerance to P Gd $_{2}$ Ti $_{2}$ O $_{2}$ hitherto considered as the prominent Pu-immobilization matrix. P Gd $_{2}$ Zr $_{2}$ O $_{7}$ is also known to have a peculiar second ionic-conductivity maximum. Motivated by these incentives, we have lately conducted a systematic EXAFS and $^{155}$ Gd-Moessbauer study of Gd $_{y}$ (Zr or Ti) $_{1-y}$ O $_{2-y/2}$ prepared by unconventional balling-milling techniques and subsequent different-types of heat-treatments. Those results are comparatively presented and discussed from the local-structure side revealed by the either method in a different fashion.

Language	:	English
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Meeting title	:	6th Workshop on Speciation, Techniques, and Facilities for Radioactive Materials at Synchrotron Light Sources and Other Quantum Beam Sources (Actinide XAS 2011)
Held date	:	2011/03
Location (city)	:	Harima
Location (country)	:	Japan
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Keywords	:	no keyword
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Registration No. : BB20103803
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Local-structure of GdZrO and GdTiO probed by EXAFS and Gd-Moessbauer methods

Local-structure of Gd $_{2}$ Zr $_{2}$ O $_{7}$ and Gd $_{2}$ Ti $_{2}$ O $_{7}$ probed by EXAFS and $^{155}$ Gd-Moessbauer methods