Ferroelectric Switching and Phase Transition in Composites from Ferroelectric Metal–Organic Framework of [ND₄][Zn(DCOO)₃] and Silicon Dioxides

Abstract

A composite from a ferroelectric metal–organic framework of [ND₄][Zn(DCOO)₃] and nano-dispersed silicon dioxides nanoparticles (nSiO₂) has been synthesized. The study investigates the influence of nSiO₂ on ferroelectric switching and phase transition properties in [ND₄][Zn(DCOO)₃]. It was indicated that the addition of nSiO₂ led to the increase in phase transition temperatures and the inhibition of repolarization in ferroelectric parts. When the nSiO₂ amount increased, the saturated dielectric hysteresis loops were more difficult to obtain and transformed into unsaturated ones with the rise of coercive field. The residual water molecules kept on nSiO₂ were found to be responsible for the above anomalies.

Keywords:

• ferroelectric metal–organic frameworks
• ferroelectric switching
• phase transition
• dielectric hysteresis loops