Bi_20TiO_32 nanocones prepared form Bi-Ti-O mixture by metalorganic decomposition method

摘要

Bi_20TiO_32 in the form of nanocones are reported for the first time, which have been found during the formation of Bi_2TiO_7 nanocrystals. Bi_20TiO_32 nanocones were prepared by metaloriganic decomposition technique. From X-ray Patterns, it was found that Bi_20TiO_32 is a metastable phase, and can transform gradually into Bi_2Ti_2O_7 phase with the Annealing time increasing at a temperature of 550 deg. C. The image of field emission scanning electron microscopy shows that the lengths of the nanocones re up to several micrometers and the diameters of cusps range from 20 to 200 nm. The studies of transmission electron microscopy show that the nanocones are crystalline Bi_20TiO_32. The growth Mechanism of Bi_20TiO_32 nanocones has been proposed, which is similar to the vapor-liquid-solid growth mechanism.