Dependence of Dielectric Properties of 0.9Pb(Mg_1/3Nb_2/3)O₃-0.1PbTiO₃ Crystals on the Crystallographic Orientation and External Electric Field

The orientation dependences of electric field effect on dielectric behaviors of relaxor-based 0.9PMN–0.1PT crystal were revealed by examining the biased dielectric properties. The relaxor states extend at the range from 10°C to 80°C under zero dc bias field with different frequencies, but DC bias field could modulate the domain states and induce a stable ferroelectric macrodomain state apparently in the ⟨001⟩-orientated crystal under 300 V/mm electric field. The electric permittivity of the poled crystals disclosed the existence of the transformation between microdomain state with randomly distributed dipoles and metastable ferroelectric state with dipoles partially oriented.

Keywords:

• Relaxor ferroelectrics
• PMNT single crystals
• DC bias field
• electric permittivity

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 50272075) and the High Technology and Development Project of the People's Republic of China (Grant No. 2002AA325130).