Ba-NbエトキシドからBa_5Nb_4O_<15>の結晶化過程の微構造的考察(<特集>イノベーティブセラミックス(I))

概要

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Ba_5Nb_4O_<15> was successfully crystallized from Ba5-Nb4 ethoxide by heating. Microstructual characterization of specimens annealed at various temperatures was performed by using a transmission electron microscope (TEM). Below 673 K, the ethoxide was decomposed to an amorphous matrix. At 773 K, small crystals with a size of 2-3 nm formed in the amorphous phase..The crystal was grown by heating, and then Ba5Nb4Oi5 crystals 70-150 nm in size formed at 1173 K. The crystallization process was successfully observed in situ by TEM using a thermal specimen stage. The grain growth process from polycrystal to five single crystals could be recorded. We propose a formation mechanism of Ba_5Nb_4O_<15> from Ba_5-Nb_4 ethoxide.
社団法人日本セラミックス協会の論文
2005-01-01