摘要
测量了系列Mg^(2+):LiNbO_3晶体的吸收边,根据晶体吸收边紫移和离子极化理论,提出:Mg^(2+)将首先取代位于Li^+位的Nb^(5+),当浓度超过5mol％后,才开始进入正常Li^+位。此模型可解释Mg^(2+):LiNbO_3抗光折变增强和光电导增大的机制。
The absorption edges of lithium niobate crystals doped with magnesium were measured. Based on the violet-displacement of the absorption edges of the crystals and the ion-polarization theory, it is proposed that Mg^(2+) displaces Nb^(5+) at Li^+ site at first, and only when Mg content is above 5 mol％, Mg^(2+) enters the normal Li^+ site. The mechanism of the improvement of antiphotorefractive ability and the increase of photocon-ductivity of Mg: LN crystals can be explained by this model.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1991年第6期523-526,共4页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
关键词
晶体
掺镁铌酸锂
吸收边
离子极化
lithium niobate crystals doped with magnesium
absorption edge
ion polarization
