Study of La substituted four-layer Aurivillius compound Bi _5 FeTi _3 O _15

The present work report synthesis of four-layer Aurivillius compound with systematic replacement of A-site Bi ^3+ cation via La ^3+ . Four-layer Aurivillius structure and phase purity is confirmed by x-ray diffraction measurements. Raman spectroscopy measurement indicate that La replaces Bi from perovskite like slab. M ö ssbauer spectroscopy measurement shows the presence of paramagnetic behaviour at room temperature and confirms the presence of Fe ^3+ in octahedral environment. Further, magnetization measurements indicate paramagnetic nature down to 5K similar to parent compound (Bi _5 FeTi _3 O _15 ) and suggest La substitution at A-site does not induce the magnetic ordering.