Ferroelectricity Driven by Twisting of Silicate Tetrahedral Chains (pages 8088–8092)
Prof. Hiroki Taniguchi, Dr. Akihide Kuwabara, Dr. Jungeun Kim, Younghun Kim, Dr. Hiroki Moriwake, Prof. Sungwng Kim, Takuya Hoshiyama, Tsukasa Koyama, Prof. Shigeo Mori, Prof. Masaki Takata, Prof. Hideo Hosono, Prof. Yoshiyuki Inaguma and Prof. Mitsuru Itoh
Article first published online: 14 JUN 2013 | DOI: 10.1002/anie.201302188
A lead-free ferroelectric: The occurrence of ferroelectricity is demonstrated in a silicate-based compound (Bi2SiO5, see picture), by direct observation of polarization switching. The mechanism of ferroelectricity in Bi2SiO5 has been studied by Raman scattering, transmission electron microscopy, X-ray powder diffraction, and first-principles calculations. The observed ferroelectricity stems from twisting of the one-dimensional SiO4 tetrahedral chain.