RESUMO
Hybrid materials possessing piezo- and ferroelectric properties emerge as excellent alternatives to conventional piezoceramics due to their merits of facile synthesis, lightweight nature, ease of fabrication and mechanical flexibility. Inspired by the structural stability of aminophosphonium compounds, here we report the first A3 BX6 type cyanometallate [Ph2 (i PrNH)2 P]3 [Fe(CN)6 ] (1), which shows a ferroelectric saturation polarization (Ps ) of 3.71â µC cm-2 . Compound 1 exhibits a high electrostrictive coefficient (Q33 ) of 0.73â m4 â C-2 , far exceeding those of piezoceramics (0.034-0.096â m4 â C-2 ). Piezoresponse force microscopy (PFM) analysis demonstrates the polarization switching and domain structure of 1 further confirming its ferroelectric nature. Furthermore, thermoplastic polyurethane (TPU) polymer composite films of 1 were prepared and employed as piezoelectric nanogenerators. Notably, the 15â wt % 1-TPU device gave a maximum output voltage of 13.57â V and a power density of 6.03â µW cm-2 .