POLYCRYSTALLINE BARIUM TITANATE FIBER HAVING ORIENTED CRYSTALLOGRAPHIC AXIS

摘要

PURPOSE:To enable economic synthesis of a microcrystalline fiber consisting of a single phase of BaTiO3, by orienting the crystal axis in the extending direction of the fiber. CONSTITUTION:Ba oxide or a compound decomposable into the Ba oxide in an amount to provide quantitative ratio of xBaO.TiO2 (x is a real number of =1) to TiO2 contained in a titanic acid fiber expressed by the formula TiO2.nH2O (n is 1-6) and an NaCl-KCl based flux in an amount of =50wt.% based on BaO.TiO2 as the standard are added to the titanic acid fiber, dispersed and mixed in water to provide a slurry. The resultant slurry is spray-dried and fired at 500-800 deg.C to form barium titanate. The fired substance is then dispersed in hot water or an acid and the flux and excess Ba raw material compound are dissolved, washed and dried to afford the aimed barium titanate fiber. Thereby the fiber of a polycrystal 4, consisting of microcrystalline gains 3 and having the orientation direction 2 of the crystallographic axis in the extending direction 1 of the fiber is obtained.