Pressure instabilities up to 46 GPa in the relaxor ferroelectric PbZn1/3Nb2/3O3

Brahim Dkhil (1) , Pierre-Eymeric Janolin (1) , P. Bouvier (2) , J. Kreisel (3) , P. A. Thomas (4)

1 SPMS - Laboratoire Structures, Propriétés et Modélisation des solides
2 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces
3 LMGP - Laboratoire des matériaux et du génie physique
4 Department of Physics [Coventry]

We report a high-pressure investigation of the relaxor ferroelectric lead zinc niobate PbZn1/3Nb2/3O3 (PZN) up to 46 GPa, which is the highest pressure yet attained in the study of relaxors. The evolution of both Raman and x-ray scattering with pressure gives evidence for important pressure instabilities, which find its expression in three successive phase transitions. The observed pressure-induced suppression of diffuse scattering above 5 GPa is similar to recent reports and supports the hypothesis that this is a general feature in relaxors at high pressures.

Mots clés: PBTIO3; PBMG1/3NB2/3O3; LEAD MAGNESIUM NIOBATE; ZONE-CENTER PHONONS; X-RAY-SCATTERING; SINGLE-CRYSTALS; NEUTRON-SCATTERING; RAMAN-SCATTERING; PHASE-TRANSITION; RANGE ORDER

Domaines: Chimie-Physique [physics.chem-ph]

Brahim Dkhil, Pierre-Eymeric Janolin, P. Bouvier, J. Kreisel, P. A. Thomas. Pressure instabilities up to 46 GPa in the relaxor ferroelectric PbZn1/3Nb2/3O3. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2006, 73, pp.094128. ⟨10.1103/PhysRevB.73.094128⟩. ⟨hal-00133258⟩