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Phase Transformation Behavior of a Pyrochlore‐Type CeO 2 –ZrO 2 Binary Compound
Author(s) -
Morikawa Akira,
Yamamura Kae,
Suda Akihiko,
Tanabe Toshitaka,
Nobukawa Takeshi,
Chiba Akiya,
Takahashi Naoki
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13322
Subject(s) - pyrochlore , materials science , crystallite , tetragonal crystal system , phase (matter) , transmission electron microscopy , crystallography , solid solution , superlattice , crystal structure , chemistry , nanotechnology , metallurgy , optoelectronics , organic chemistry
The phase transformation behavior of the superlattice structure of a CeO 2 – ZrO 2 pyrochlore‐type binary compound ( CP ) was investigated so as to better understand how to improve the thermal stability of such a system. CP was synthesized through high‐temperature reduction of a conventional CeO 2 – ZrO 2 solid solution with a 1:1 molar ratio of Ce and Zr . High‐resolution transmission electron microscopy and selected‐area electron diffraction clearly revealed that the pyrochlore structure of CP transformed to the standard disordered cubic fluorite or tetragonal zirconia structure after having been subjected to a high‐temperature durability test; moreover, it was determined that this phase transformation moves inward from the crystallite surface. This discovery suggests a new method by which to improve upon this material for practical applications.