Polar Nanoregions in Relaxor Ferroelectrics: Study of Acoustic Modes by Micro-Brillouin Scattering

Abstract

Micro-Brillouin scattering and dielectric experiments were performed on PLZT-x/65/35 (x = 8.0, 9.0, 9.4, 10.0) relaxor ferroelectric ceramics in thermally depoled state. Local polarization with random orientation associated to polar nanoregions (PNRs) indeed appeared in these ceramics. A low temperature anomaly was observed in the dielectric constant showing clear aging character of PLZT relaxor ceramics.

Keywords:

• Relaxor ferroelectrics
• PLZT
• Polar nanoregions
• Acoustic modes

PACS:

• 77.80.Jk
• 78.35.+c
• 77.80.B-
• 77.84.Dy

Acknowledgments

One of the authors (GS) is grateful to Institute of Materials Science, University of Tsukuba, Japan, for partial financial support.