Preparation and characterization of barium strontium titanate nanoparticles by low temperature calcination method

Barium strontium titanate(BST) nanoparticles were successfully prepared by the low temperature(300-500℃) calcination method,using barium hydroxide,strontium hydroxide,and tetrabutyl titanate as starting materials.XRD,SEM,TEM and IR techniques were used to characterize the fabricated barium strontium titanate nanoparticles and the formation process of the products was investigated by means of TG-DTA.It is confirmed that the barium strontium titanate nanoparticles with uniform size distribution and particle sizes of 13-20nm,similar to spherical shape,are cubic perovskite structure.The powders are true solid solution,and as the increases of the doping proportion of Sr2+,both the cell parameter a and the cell volume V become smaller.The a values are linearly related with the compositions of the powders,which is in accord with Vegard's law.