Halogen-substituted quasi-spherical tetraethylammonium cations induce reversible molecular ferroelectricity in indium-based hybrid materials

Four high-temperature ferroelectric materials: [(CH 3 CH 2 ) 3 CH 2 XN][InBr 4 ](X = C( 1 ), Cl( 2 ), Br( 3 ), I( 4 )) showing switchable phase transition, dielectric anomaly, SHG behavior, were successfully designed and synthesized.