Hydrothermal Preparation of Bismuth Titanate Nanopowders

摘要

Bismuth titanate nanopowders were prepared by the hydrothermal method from Bi(NO_3)_3-5·H_2O, TiCl_4 and KOH aqueous solution. The influences of reaction temperature and KOH concentration on the crystalline phase, morphology, and grain size of the prepared Bi_4Ti_3O_(12) powders were investigated. The results showed that well-crystallized, dispersive Bi_4Ti_3O_(12) nanopowders could be prepared by the hydrothermal treatment at 220-260 ℃ for 6 h, in the case of [Ti]= 0.1 M, Bi:Ti = 4:3 and [KOH]=1.0-2.0 M. The prepared Bi_4Ti_3O_(12)powders of the orthorhombic structure were observed to be rectangle slice-shaped, and the grain sizes were about 30 nm in width and above 100 nm in length. It was also confirmed that the desired concentration of KOH decreased with increasing of the treatment temperature.