Crystal Structure of Sr0.4Ce0.4TiO3 Ceramics
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.
Ubic, Rick; Subodh, Ganesanpotti; Gout, Delphine; Sebastian, Mailadil T.; and Proffen, Thomas. (2009). "Crystal Structure of Sr0.4Ce0.4TiO3 Ceramics". Chemistry of Materials, 21(19), 4706-4710.