Crystal structure of Sr 0.4 Ce 0.4 TiO 3 ceramics

Abstract

A cerium-doped SrTiO3 compound with the composition Sr0.4Ce0.4TiO3 has been produced by conventional solid-state processing. The structure of this compound was analyzed by X-ray, electron,and neutron diffraction. While no superlattice can be observed via X-ray diffraction, both electron and neutron diffraction show evidence of a noncubic supercell caused by antiphase tilting of oxygen octahedra. The most likely space group is C2/c, corresponding to an a-b-b- tilt system. Octahedra are tilted by ∼5 about the pseudo-cubic a-axis and ∼1.5 about the pseudo-cubic b- and c-axes.