ベーマイト板状晶の水熱合成(<特集>水溶液科学に立脚したセラミックス合成プロセス)

概要

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Large plate crystals of boehmite up to 4μm were prepared from Al(NO_3)_3 solutions with the addition of NaOH under hydrothermal conditions at 250℃ for 6h. The conditions to obtain monodispersed boehmite large plate crystals were determined to be in the range of OH/Al molar ratio from 3.5 to 3.8 and Al concentration from 1.3 to 2.0mol/kg. Bayerite formed by mixing the starting materials changed to gibbsite at 200℃, and at the same time boehmite started to crystallize from gibbsite. Even after complete phase change from gibbsite, small boehmite crystals grew larger by dissolution and precipitation mechanism. The key to obtain boemite large plate crystals is the preparation of homogenous fine boehmite crystals by quickly heating fine gibbsite crystals to the boehmite stable region, as well as the selection of OH/Al molar ratio and Al concentration.
社団法人日本セラミックス協会の論文
2007-12-01