金属アルコキシドの完全加水分解による非晶質LiNbO_3粉体の合成とキャラクタリゼーション

概要

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Amorphous LiNbO_3 powder compacts derived from completely hydrolyzed metal alkoxides were characterized in terms of Li^+ coordination and conductivity at temperatures below 200℃. Amorphous LiNbO_3 powders were prepared by the dehydration of lithium niobium hydroxide hydrate gel at 200℃ (LiNbO_<m/2>(OH)_<6-m>・nH_2O) which was precipitated by the complete hydrolysis of lithium and niobium double alkoxide with water. The powders heated at 200℃ of amorphous LiNbO_3 powders, which were X-ray amorphous, showed broad bands on Raman spectra indicating an intermediate stage with a tendency to crystallization. The state of Li in the amorphous LiNbO_3 powders was also characterized by ^7Li MAS NMR, and compared with that in polycrystalline LiNbO_3. ^7Li MAS NMR spectra of amorphous LiNbO_3 showed an extra small broad band downfield shifted by about 13 ppm from the main band. This extra band is attributable to the different Li state in amorphous structure from that in the polycrystalline structure. This disordered state of Li ions should give rise to the mobile Li ions that might attribute partly to the conductivity.
社団法人日本セラミックス協会の論文
1996-07-01