The Effect of Axial Pressure on Domain State and Dielectric Properties of Na_0.5Bi_0.5TiO₃ and Related Materials

Abstract

The domain phenomena measurements of Na_0.5Bi_0.5TiO₃ (NBT) and Na_0.5Bi_0.5TiO₃-BaTiO₃ (NBT-BT) under axial pressure have been performed. It was found that the measured materials are sensitive to external stress. This is connected with: (i) the shift of the phase transition temperature, (ii) decrease of permittivity and reduction of thermal hysteresis, and (iii) change in domain structure. It was shown that it is possible to obtain a stable ferroelastic monodomain state under axial pressure < 100 bar. Taking into account a larger value of coercive field and to big external stresses—the investigated materials can be used in severe conditions.

Keywords:

• Na_0.5Bi_0.5TiO₃
• domain state
• dielectric properties
• axial pressure

AIP's: :

• 77.70+a
• 77.22.Ej
• 77.22.Ch
• 77.84.Dy

Acknowledgments

This work was supported by Polish grant 4T08A038025.