The First Room-Temperature Ferroelectric Sn Insulator and Its Polarization Switching Kinetics.

Wang, Yazhong; Huang, Fei-Ting; Luo, Xuan; Gao, Bin; Cheong, Sang-Wook · Adv Mater · 2017

basic_science · Level V

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Abstract

Sr<sub>3</sub> Sn<sub>2</sub> O<sub>7</sub> is the first room-temperature ferroelectric Sn insulator with switchable electric polarization. The ferroelastic twin domains are observed using a polarized optical microscope. The polarization hysteresis loop clearly demonstrates the ferroelectric property. Intriguing polarization switching kinetics are observed through an in situ poling process using a dark-field transmission electron microscopy technique.