The slightly larger tilting observed in our experimental iDPC data and DFT Configuration: b aligns with the tolerance factor for the B6TFMO composition (t = 0.90), which is lower than that of A2Bi4Ti5O18 . Furthermore, our investigations indicate that it is necessary for the B6TFMO the primary driving factor for changes in the L3 eg EELS peak from the outer to center perovskite layer is the atomic displacement and tetragonal distortion of Ti, influenced by its position within the Aurivillius unit cell.