Preparation and characterization of bismuth silicate nanopowders

摘要

Bismuth silicate (Bi4Si3O12) nanopowders were prepared by the sol-gel method.Tetraethyl orthosilicate (TEOS) and Bi2O3 were used as the starting materials.The precursors were heat-treated at 750~C for 2 h.The size distribution of Bi4Si3O12 nanopowders is 40-100nm.The thermogravimetry and differential thermal analysis (TG-DTA) curves,the X-ray diffraction (XRD) patterns and the transmission electron microscopy (TEM) microphotograph of Bi4Si3O12 were discussed.Compared with crystal materials,the excitation and emission spectra of Bi4Si3O12 nanopowders indicated a blue shift.