セリアーガドリニア系ナノ粉体の作製とキャラクタリゼーション(<特集>イノベーティブセラミックス(I))

概要

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I Three different methods of synthesis of ceria-gadolinia (CGO) nanopowders are presented. We established a technique of the synthesis of uniformly aggregated, agglomerate-free CGO in which ceria-gadolinia composite nano-aggregates (15-40 nm) are prepared by nucleation and crystallization of ceria on the surface of preliminary synthesized, hydrolyzed and ultrasonically de-agglomerated gadolinia (3-17 nm). Nano-size aggregates (12-65 nm) of CGO were produced during subsequent non-isothermal calcination. The incorporation of the small concentrations of gadolinia in the ceria lattice was studied using the electron spin resonance technique. It was confirmed that Gd^<3+> occupies the sites of both cubic and axial symmetry. With increasing concentration, Gd^<3+> forms a defect complex with the oxygen vacancy.
社団法人日本セラミックス協会の論文
2005-01-01