%0 Journal Article
%T Observation of Ferroelectric Structures of Near-stoichiometric LiNbO3 Crystal and Its Mechanism<br>近化学计量比LiNbO3晶体电畴结构观察和机理探讨
%A ZHENG Yan-Qing
%A <br>郑燕青
%A 陈建军
%A 路治平
%A 王绍华
%A 施尔畏
%J 无机材料学报
%D 2005
%I Science Press
%X Near stoichiometric LiNbO3 crystals of varied composition were grown by a double crucible Czochralski method. An etching method was applied to observe the ferroelectric domain structures of the as-grown crystals. The results show that the congruent crystal grown along z-axis contains a domain structure consisting of concentric rings. The crystal with composition of 49.4mol% Li2O contains a special domain structure consisting of three fan-shape opposite domains with three-fold symmetry, which is consistent with the symmetry of the crystal structure. The crystal with composition of 49.7mol% Li2O has a single domain structure. The formation mechanism of the domain structures was discussed based on a thermoelectric field model. It is argued that the sign of the temperature gradient along z-axis in the front of para- ferroelectric interface is the critical factor that determines the polarity direction of the domain in development. Finally, the technological methods to control the domain structures were discussed.
%K LiNbO3 crystal
%K stoichiometry
%K ferroelectric domain structure
%K mechanism<br>LiNbO3晶体
%K 化学计量比
%K 电畴结构
%K 机理
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=ABC0063016AF57E1C73EF43C8D2212BD&aid=3AD096F2A05842DA&yid=2DD7160C83D0ACED&vid=A04140E723CB732E&iid=B31275AF3241DB2D&sid=55C36125E841856F&eid=5A700C739C4FF128&journal_id=1000-324X&journal_name=无机材料学报&referenced_num=0&reference_num=13