Abstract
Structural and dielectric evidences are advanced to show that the (SCT) system undergoes an antiferroelectric (AFE) phase transition in the composition range . Stabilization of the AFE phase, instead of the ferroelectric (FE) phase known for , is shown to be intimately linked with the nonpolar antiferrodistortive phase transitions driven by the and point instabilities preceding the AFE transition. It is proposed that the disorder and frustration introduced by substitution in the incipient FE matrix of leads to the smearing of the response in SCT for akin to dipole glasses and relaxor ferroelectrics.
- Received 24 September 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.3726
©2000 American Physical Society