A new piperidyl-based molecular ferroelectric piperidine-4ylmethanaminium perchlorate (compound 1) has been successfully synthesized, which undergoes a reversible phase transition around T c = 258.8 K. The spontaneous polarization of compound 1 is about 0.63 μC/cm 2 and coercive field as small as 1.14 kV/cm at 192 K. The variable-temperature single-crystal X-ray diffraction reveals that the space group transforms from a polar space group of P2 1 at 173 K to a centrosymmetric space group of P2 1 2 1 2 1 at 293 K. Especially, the dielectric anomaly at the phase transition temperature increases more than 4 times, which indicates potential applications in switchable dielectric devices.[a] X.
A new molecular ferroelectric is discovered in an organic–inorganic hybrid compound, (C6H5NH3)2CdCl4, which undergoes a reversible order–disorder ferroelectric phase transition at 369 K.
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