NDLI: Structural investigation of oxygen insertion within the Ce2Sn2O7–Ce2Sn2O8 pyrochlore solid solution by means of in situ neutron diffraction experiments

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Structural investigation of oxygen insertion within the Ce₂Sn₂O₇–Ce₂Sn₂O₈ pyrochlore solid solution by means of in situ neutron diffraction experiments

Content Provider	Royal Society of Chemistry (RSC)
Author	Rabardel, Louis Demourgues, Alain Menetrier, Michel Tolla, Bruno Pouchard, Michel Isnard, Olivier Seguelong, Thierry
Copyright Year	1999
Abstract	The amazing oxygen exchange properties within the Ce2Sn2O7–Ce2Sn2O8 pyrochlore solid solution were investigated by means of in situ neutron diffraction experiments. The structural modification of the Ce2Sn2O7 phase heated under oxygen up to 1000 °C was followed on the basis of the neutron diffraction patterns, continuously collected with a 5 min counting rate at 2.529 Å. The structure of the Ce2Sn2O8 pyrochlore phase has been previously determined at room temperature on the basis of the powder neutron diffraction pattern collected at 1.594 Å. Contrary to the oxygen-intercalated zirconate pyrochlores, oxygen atoms preferentially occupy a 32e crystallographic site, which is more distant from the Sn4+ cation than the other interstitial 8a site. Two kinds of local oxygen defects were identified within the Ce2Sn2O8 – ε (0 ≤ ε ≤ 0.05) pyrochlore at 400 °C. The most stable is a tetrahedron of oxygen atoms (32e site) around an oxygen vacancy (8b site), comparable to the Willis clusters found in UO2 + x. The other, lying around the 8a site, involves short oxygen–oxygen distances and constitutes a new type of oxygen cluster around tin atoms. In addition to the successive disappearance of these local defects from 400 °C to 700 °C, cerium deinsertion was detected above 500 °C. This leads to new cerium deficient Ce2 – xSn2Oy phases, which exhibit structural changes. The oxygen storage capacity (OSC) of the Ce2Sn2O7 pyrochlore was thus detailed by considering the successive insertion/deinsertion reactions and the Ce–Sn–O phase diagram.
Starting Page	3131
Ending Page	3136
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	9
Issue Number	12
Journal	Journal of Materials Chemistry
DOI	10.1039/a905914h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	OSC Willis Oxygen Pyrochlore Solid solution Neutron diffraction Ion Tetrahedron Tin Cerium Oxygen storage Phase diagram
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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