Sample shape influence on the antiferroelectric phase transitions in dipolar systems subject to an external field
Abstract
A continuous change in the macroscopic shape of a sample from a needle through a sphere to a plate is shown to greatly affect phase transitions in Ising dipolar systems. The first- and second-order phase transition lines with critical and tricritical points appear, coexist, and disappear on the phase diagram with varying sample shape. The values of the shape-dependent depolarization factor corresponding to the changes in the phase diagram are identified.
- Publication:
-
Physical Review B
- Pub Date:
- February 2002
- DOI:
- 10.1103/PhysRevB.65.052104
- Bibcode:
- 2002PhRvB..65e2104P
- Keywords:
-
- 64.70.-p;
- 42.70.Jk;
- 64.60.Kw;
- 77.80.-e;
- Specific phase transitions;
- Polymers and organics;
- Multicritical points;
- Ferroelectricity and antiferroelectricity