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SEMINAR
The Key Lab of Inorganic Functional Materials and Devices
Shanghai Institute of Ceramics, Chinese Academy of Sciences
中 国 科 学 院 上 海 硅 酸 盐 研 究 所 无 机 功 能 材 料 与 器 件 重 点 实 验 室
Polar functional materials and the crystal chemistry underlying their behaviour
Speaker
Prof. Ray Withers
Research School of Chemistry, The Australian National University, Canberra, Australia
时间：9月3日 （星期二）上午10:00
地点：4号14楼第一会议室
联系人： 李永祥 (52411066)
Polar functional materials and the crystal chemistry
Ray Withers
Research School of Chemistry, The Australian National University, Canberra, Australia
In this talk, the crystal chemistry underlying polar behaviour will be discussed in the context of several lead free ferroelectric and/or piezoelectric systems including the K1-xNaxNbO3 (KNN), Sn-doped BaTiO3 and (1-x)BaTiO3. xBi1/2Mg1/2TiO3 (BT-BMT) systems. The use of electron diffraction and bond valence sum calculations in understanding the local crystal chemistry of such systems will be highlighted along with the role this plays in the series of phase transitions on heating and cooling associated with the progressive ordering of the off‑centre displacements responsible for their ferroelectric and piezoelectric response behaviour. The crystallography underlying these various phase transitions and its relationship to their properties will also be discussed.
