Abstract
The specific heat of typical relaxors, (PMN) and (PMT), was measured by adiabatic and relaxation methods between 2 and 420 K. A broad anomaly was found in the specific heat curve over the wide temperature range between 150 and 500 K for PMN, and between 50 and 400 K for PMT, which provides evidence for the formation of ferroelectric nanoregions (FNR) in the paraelectric matrix. The entropy of the anomaly was estimated as and for PMN and PMT, respectively, which implies an order-disorder-type mechanism for the formation of FNR.
- Received 25 November 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.205901
©2003 American Physical Society