A three-dimensional phenomenological model is proposed to describe both ferroelectricity and antiferroelectricity based on the Ginzburg-Landau-Devonshire theory. Its application to the multiferroic Sm-doped BiFeO3 system describes the temperature-, pressure-, and composition-induced ferroelectric to antiferroelectric phase transitions. The constructed temperature-composition and temperature-pressure phase diagrams show that compressive hydrostatic pressure and Sm doping have similar effects on the ferroelectric and antiferroelectric phase transitions. It is also indicated from the temperature-pressure phase diagram that the experimentally observed phase of BiFeO3 under the hydrostatic pressure from 3 GPa to 10 GPa is a PbZrO3-like antiferroelectric phase.
- Antiferroelectricity,
- Ferroelectricity,
- Hydraulics,
- Hydrostatic pressure, Anti ferroelectrics,
- Antiferroelectric phase transition,
- Ferroelectricity and antiferroelectricity,
- Ginzburg-Landau,
- ITS applications,
- Phenomenological modeling,
- Pressure phase,
- Temperature composition, Phase diagrams
Available at: http://works.bepress.com/yijia-gu/37/