Doping Bismuth Titanate with Sodium results in a reduction in the electrical conductivity. This is in apparent contradiction to the established conduction mechanism by holes. Sodium doping also results in phase transformation. High resolution TEM was done to study the structure of Bismuth Titanate. The mechanism of the transformation was studied by observing the transformation front and the crystallographic index of the transformation front was calculated from the Moire fringes that were observed in the high- resolution TEM image. From this, a mechanism has been proposed for the phase...