A morphotropic phase boundary system based on polarization rotation and polarization extension
Abstract
Many ferroelectric solid solutions exhibit enhanced electromechanical properties at the morphotropic boundary separating two phases with different orientations of polarization. The mechanism of properties enhancement is associated with easy paths for polarization rotation in anisotropically flattened free energy profile. Another mechanism of properties enhancement related to free energy flattening is polarization extension. It is best known at temperature-driven ferroelectric-paraelectric phase transitions and may lead to exceedingly large properties. Its disadvantage is temperature instability of the enhancement. In this paper a temperature-composition phase diagram is proposed that exhibits compositionally driven-phase transitions with easy paths for both polarization rotation and polarization extension.
- Publication:
-
Applied Physics Letters
- Pub Date:
- August 2010
- DOI:
- 10.1063/1.3479479
- arXiv:
- arXiv:1007.4394
- Bibcode:
- 2010ApPhL..97f2906D
- Keywords:
-
- dielectric polarisation;
- ferroelectric transitions;
- phase diagrams;
- 81.30.Dz;
- 77.22.Ej;
- 77.80.B-;
- Phase diagrams of other materials;
- Polarization and depolarization;
- Condensed Matter - Materials Science
- E-Print:
- accepted in Appl. Phys. Lett./ presented at APS 2010 March meeting