近化学计量比Tb:Fe:LiNbO_3晶体的光谱特性及组分测定  

Spectrum Properties and Compound Mensuration of Near-stoichiometric Tb:Fe:LiNbO_3 Crystals

作　　者：刘金伟[1] 刘国庆[1] 江竹青[1] 陶世荃 

机构地区：[1]北京工业大学应用数理学院,北京100022

出　　处：《人工晶体学报》2006年第2期315-318,共4页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.60377003);北京市教委科技发展计划资助项目(No.05006012200201)

摘　　要：按化学计量比,用提拉法成功生长了不同掺量的Tb:Fe:L iNbO3晶体,分别测量了掺杂L iNbO3晶体在紫外(313nm)曝光前后的吸收光谱,曝光后吸收谱线整体上移,找到了吸收谱线上移最大的掺量比。并用差热分析仪DTA测量了居里温度Tc,从而计算出L i/Nb的比例。分析表明,Tb:Fe:L iNbO3晶体的存储性能与掺量、定比有密切的联系,是一种优良的大容量体全息记录材料。According to stoichiometry, the Tb：Fe：LiNbO3 crystals with no defect were grown from melt by Czochraski technique. The absorption spectrua （400-700nm） of different doped LiNbO3 crystals before and after UV irradiation （313nm） were measured respectively. The results showed that the doped crystals have a strong absorption after UV irradiation, and the doped proportion for the doped LiNbO9 crystals of the strongest absorption spectrum was found. Curie temperature Tc was measured by differential thermal analysis （ DTA）, and the proportion of Li/Nb was calculated further. The analysis results showed that the holographic storage property of Tb： Fe： LiNbO3 crystals is related to the impurity concentration and stoichiometry. It is a good recording material used in the volume holographic storage.

关 键 词：铌酸锂晶体 近化学计量比 吸收光谱 组分测定 

分 类 号：O78[理学—晶体学]