Neutron diffraction and X-ray absorption spectroscopic analyses for lithiated Aurivillius-type layered perovskite oxide, Li2Bi4Ti3O12

The chemical lithiation of Aurivillius-type layered perovskite oxide, Bi4Ti 3O12 (BTO), was demonstrated for the first time. The crystal and electronic structures of the lithiated BTO were characterized by neutron diffaction a nd X-ray absorption spectroscopic analyses. According to the neutron diffac tion studies, it has been found that the lithium atoms are positioned betwe en a perovskite block and a Bi2O2 layer. From the Bi L-III- and Ti K-edge X ANES/EXAFS analyses, it has been found that significant amounts of Bi and T i cations are reduced due to the Li-intercalation, and that the local struc ture around Ti becomes more distorted.