化学计量比LiNbO_3晶体的畴结构及完整性研究  

Study on Domain Structure and Integrality of the Near-stoichiometric LiNbO_3 Crystal

作　　者：孙敦陆 杭寅[4,3] 张连瀚 钱小波[4,3] 李世峰[5] 徐军 罗国珍[6] 祝世宁[6] 朱永元[6] 周圣明[7] 

机构地区：[1]中国科学院安徽光学精密机械研究所 [2]中国科学院上海光学精密机械研究所,上海201821 [3]上光富晶光电材料有限公司,昆山215316 [4]中国科学院上海光学精密机械研究所 [5]上光富晶光电材料有限公司 [6]南京大学固体微结构国家重点实验室 [7]安徽大学物理系

出　　处：《人工晶体学报》2002年第4期387-391,共5页Journal of Synthetic Crystals

摘　　要：本文对用助熔剂提拉法生长的两种化学计量比LiNbO3 晶体进行了测试分析 ,并与同成分LiNbO3 晶体相比较。通过差热分析和X射线粉末衍射测试 ,得出随着晶体中Li2 O含量的增加 ,其居里温度变高 ,晶格常数变小。用酸腐蚀晶体 ,通过直接观察和金相照片 ,分析其畴结构 ,得出SLN11是单畴生长 ,首次观察出SLN19晶体在Z切面上出现了三块面积较大的对称反畴区 ,将其称为区域性单畴。另外 ,还对晶体在 (0 0 1)方向抛光面的不同位置测量了其回摆曲线 ,得到了其中SLN19晶体有着较完整的结晶面。期望通过改变生长参数 ,长出完全单畴且更加接近化学计量比的LiNbO3Two kinds of near stoichiometric LiNbO 3 crystals grown with flux pulling method were measured and analyzed in this paper.We compared the crystals with congruent one.The curie temperature is increased and lattice constant is decreased when the Li 2O content in the crystal is close to 50mol%.The domain structure was observed by naked eye and microphotography after the crystals were etched with acid.It was found that the SLN11 crystal was grown with single domain.SLN19 crystal appeared as a large and symmetric opposite domain on (001) cut plane.A growth with regional single domain was named.In addition,the swing curve was measured along (001) polishing plane on different positions.The results showed that the SLN19 crystal has a more perfect crystalloplane than the SLN11 crystal.Careful adjustments of growth parameters are required in order to get high quality stoichiometric LiNbO 3 crystals.

关 键 词：化学计量比 LINBO3晶体 畴结构 完整性 研究 居里温度 晶格常数 区域性单畴 回摆曲线 助熔剂提拉法 

分 类 号：O782.5[理学—晶体学]