Presentation Information
[8a-E217-2]Elucidation of Sr/Bi site disorder and electronic structure changes in Sr2.5Bi0.5NiO5 by temperature-dependent in-situ XANES and XRD measurements
〇Kenta Natsui1, Hideyuki Kawasoko1, Soichi Kikkawa1, Tatsuya Higaki1, Seiji Yamazoe1 (1.Tokyo metoropolitan Univ.)
Keywords:
Transition metal oxide,Local atomic arrangement,X-ray Absorption Fine Structure
The layered oxide Sr2.5Bi0.5NiO5 exhibits a unique property: upon annealing at 600 °C in air, the Sr/Bi arrangement in the rock-salt layer transitions from an ordered to a disordered state, leading to an approximately 100-fold increase in electrical resistivity. In this study, we performed temperature-dependent in-situ XANES and in-situ XRD measurements on a polycrystalline bulk sample from room temperature to 600 °C in air, tracking the changes in its electronic state and crystal structure during both the heating and cooling processes.