Study on the structure of La-doped SrBi_4Ti_4O_(15)

In this paper the structure of La-doped SBT with different doping amount was tested by XRD and raman scattering.La-doping has not destroyed the structure of SBT.With the increase of doping amount,La ion substitutes into different site and the 314 and 550cm-1 modes related to the rotating and tilting of TiO6 octahedron firstly become wide and then become sharp.La substituting into the Bi site in perovskite-like has more influence on the vibrating of TiO6 octahedron.