Switchable Dielectric Behavior and Order-Disorder Phase Transition in a New Organic-Inorganic Hybrid Compound: (CH3NH3)(4)[InCl6]Cl

摘要

A new organic-inorganic phase transition material (CH3NH3)(4)[InCl6]Cl (1), has been successfully synthesized and characterized. The compound undergoes a reversible first-order phase transition at Curie temperature Tc=284 K, accompanied with a wide hysteresis of 12 K, which investigated by differential scanning calorimetry (DSC). The temperature dependence of the dielectric permittivity discloses an obvious step-like dielectric anomaly. Single crystal X-ray diffraction reveals that the order-disorder transition of the [InCl6](3-) anion and the methylammonium cation were the main factor drove the phase transition from high temperature phase with the space group P2/m to low temperature phase with the space group P2/n. This finding indicates that In-based organic-inorganic hybrids compounds can be used to build phase transition materials, which broaden the way for exploring dielectric switching materials.