Dielectric relaxation and domain-wall freezing in (CH₃NH₃)₅Bi₂Cl₁₁ ferroelectric crystal

Abstract

For the first time, the dielectric relaxation and domain-wall freezing are reported for the single crystal of (CH₃NH₃)₅Bi₂Cl₁₁ ferroelectric, which was tested in wide ranges of frequency (1 Hz–1 GHz) and temperature (50–350 K). The results demonstrated two relaxation regions obeying the Arrhenius and Vogel-Fulcher-Tammann laws. The freezing temperature was estimated at 86,3 K using extrapolation method.

Keywords:

• Ferroelectrics
• dielectric relaxation
• domain-wall freezing
• phase transition
• ferroelectric switching