X-ray study of the structural distortion in EuTiO3

Inelastic and elastic X-ray scattering are used to investigate the structural phase transition which occurs in EuTiO3 at ~287 K. The dispersion of the soft phonon mode associated with the transition was measured about the R-point at 300 K, slightly above the transition, and is compared against a shell model. Below the structural transition temperature, a single R-point Bragg peak was observed, without any indication of more complex streaking reported from differently prepared samples.