Dielectric response behavior and displacement‐type metal‐free organic‐inorganic hybrid phase transition material: trans ‐ (NH3C6H10NH3) [ NO3 ] 2

Synthesis and Characterization of a Displacement-Type Ferroelectric-Ferroelectric Phase Transition Compound [(NH3)(CH2)3(NH3)]2[InBr6]Br·H2O

Ferroelectric materials have aroused the researchers' great interest due to their wide applications. Here, a displacement-type ferroelectric-ferroelectric phase transition material [(NH₃)(CH₂)₃(NH₃)]₂[InBr₆]Br·H₂O (1) with T_c = 143 K was successfully prepared. The ferroelectric phase transition is verified by the characterization techniques such as differential scanning calorimetry, single-crystal structure elucidation, dielectric and ferroelectric measurements. The single-crystal structure elucidation reveals that the displacement and distortion of [(NH₃)(CH₂)₃(NH₃)]²⁺ cations lead to the phase transition from Cmc2₁ to Pca2₁. The spontaneous polarizations at 293 and 133 K are 0.15 and 0.12 μC·cm^-2, respectively. We expect that this work will help in further exploration of some new ferroelectric materials.