High-Pressure Study of X-Ray Diffuse Scattering in Ferroelectric Perovskites

Sylvain Ravy (1) , Jean-Paul Itie (1, 2) , Alain Polian (2) , Michael Hanfland (3)

1 SSOLEIL - Synchrotron SOLEIL
2 IMPMC - Institut de minéralogie et de physique des milieux condensés
3 ESRF - European Synchrotron Radiation Facility

We present a high-pressure x-ray diffuse scattering study of the ABO3 ferroelectric perovskites BaTiO3 and KNbO3 . The well-known diffuse lines are observed in all the phases studied. In KNbO3 , we show that the lines are present up to 21.8 GPa, with constant width and a slightly decreasing intensity. At variance, the intensity of the diffuse lines observed in the cubic phase of BaTiO3 linearly decreases to zero at

Domaines: Autre [cond-mat.other]

Sylvain Ravy, Jean-Paul Itie, Alain Polian, Michael Hanfland. High-Pressure Study of X-Ray Diffuse Scattering in Ferroelectric Perovskites. Physical Review Letters, 2007, 99, pp.117601. ⟨10.1103/PhysRevLett.99.117601⟩. ⟨hal-00174756⟩