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Ye, Heng-Yun; Tang, Yuan-Yuan; Li, Peng-Fei; Liao, Wei-Qiang; Gao, Ji-Xing; Hua, Xiu-Ni; Cai, Hu; Shi, Ping-Ping; You, Yu-Meng; Xiong, Ren-Gen
Science, 07/2018, Letnik: 361, Številka: 6398Journal Article
Inorganic perovskite ferroelectrics are widely used in nonvolatile memory elements, capacitors, and sensors because of their excellent ferroelectric and other properties. Organic ferroelectrics are desirable for their mechanical flexibility, low weight, environmentally friendly processing, and low processing temperatures. Although almost a century has passed since the first ferroelectric, Rochelle salt, was discovered, examples of highly desirable organic perovskite ferroelectrics are lacking. We found a family of metal-free organic perovskite ferroelectrics with the characteristic three-dimensional structure, among which MDABCO ( -methyl- -diazabicyclo2.2.2octonium)-ammonium triiodide has a spontaneous polarization of 22 microcoulombs per square centimeter close to that of barium titanate (BTO), a high phase transition temperature of 448 kelvins (above that of BTO), and eight possible polarization directions. These attributes make it attractive for use in flexible devices, soft robotics, biomedical devices, and other applications.
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in: SICRIS
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