%0 Journal Article
%T The harmonon soft modes in a perovskite structure system<br>钙钛矿结构中的简谐子软模
%A Li Zhi-Qiang
%A Lu Xia-Lian
%A Chen Min
%A He Shan
%A Li Jing-De
%A <br>李智强
%A 陆夏莲
%A 陈敏
%A 何山
%A 李景德
%J 物理学报
%D 2002
%I 
%X By using the complex species method, the harmonic vibrational modes of finite crystals having perovskite structure with free boundary condition were obtained. The convergent distribution function of harmonon was given and many harmonon soft modes were found. These soft modes were used to explain the phenomenon that barium titanate crystal has the structure of a domain and c domain in ferroelectric phase transition when temperature is reduced. The theory indicated that the process of ferroelectric phase transition was involved in the excitation of screen charges and their slow diffusion on the interface, till the homogeneous spontaneous polarization appears within each electric domain.
%K lattice dynamics
%K harmonon
%K soft modes
%K barium titanate<br>晶格动力学
%K 简谐子
%K 软模
%K 钛酸钡
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=D79BFC995FDD1262&yid=C3ACC247184A22C1&vid=987EDA49D8A7A635&iid=DF92D298D3FF1E6E&sid=1593278DEEDA4D8F&eid=A7E1C896834B988A&journal_id=1000-3290&journal_name=物理学报&referenced_num=1&reference_num=8