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New Defect-crystal-chemical approach to non-vegardianity and complex defect structure of fluorite-based MO$$_{2}$$-LnO$$_{1.5}$$ solid solutions (M$$^{4+}$$=Ce, Th; Ln$$^{3+}$$= Lanthanide), 2; Detailed local-structure and ionic-conductivity analysis

Nakamura, Akio

Part I proposed a new lattice-parameter (a$$_{0}$$(ss)) model for Defect-Fluorite (DF) M$$_{1-y}$$Ln$$_{y}$$O$$_{2-y/2}$$ solid solutions (ss);this clarified their markedly non-Vegardian behavior as a macroscopic manifestation of their microscopic non-randomness represented by non-random CN(Ln$$^{3+}$$, M$$^{4+}$$) data. Part II further clarified that these CN(Ln$$^{3+}$$, M$$^{4+}$$) data can provide a quantitative description of their detailed non-random local structure such as mutually non-randomly defect (V$$_{O}$$)-coordinated cation concentrations and their intriguing ionic-conductivity behavior as a multiple V$$_{O}$$ - O$$^{2-}$$ transport process. Thus, the present model is proposed as a new quantitative a$$_{0}$$(ss) model for DF oxides and as a new direct link to their controversial defect structure. A complete description of the methodology and results of detailed local-structure and ionic-conductivity analysis is given, mainly focusing on Ce-Y.

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