硼酸钙氧钆单晶的振动光谱  

The Vibrational Spectra of Gadolinium Calcium Oxoborate Crystal

作　　者：李丽霞[1] 王继扬[1] 徐丽[1] 张怀金[1] 郑莹[1] 刘春花[1] 

机构地区：[1]山东大学环境学院晶体材料国家重点实验室,山东济南250100

出　　处：《光谱学与光谱分析》2003年第5期852-854,共3页Spectroscopy and Spectral Analysis

基　　金：国家重点基础研究发展规划资助课题项目

摘　　要：本文采用提拉法生长了硼酸钙氧钆GdCa4O(BO3)3(简称GdCOB)晶体,测定了晶体在不同几何配置下的拉曼光谱,并与三硼酸钙氧钇YCa4O(BO3)3(简称YCOB)晶体进行了比较,讨论了稀土元素对拉曼光谱的影响。由于钆和钇原子半径的差别和镧系稀土元素的晶场效应,使GdCOB晶体的部分拉曼谱线存在红移,从拉曼光谱随方向的变化可知晶体有很强的各向异性;从拉曼光谱的强度可知晶体有较强的非线性光学性质。实验可知其非线性光学特性主要来自硼氧三角形而不是氧八面体的畸变。By using Czochralski pulling method, gadolinium calcium oxoborate crystal GdCa4O(BO3)(3) (GdCOB in short) was grown. Raman spectra of the crystal have been obtained with different geometric arrangements. We compared GdCOB with yttrium calcium oxoborate (YCOB) and discussed the effect of rare-earth element on Raman spectra. We pointed out that because the atom radius of Gd is larger than that of Y and there exists the crystal field effect of lanthanide rare-earth element, the Raman spectrum of GdOOB has some red shift. From the change of Raman spectra in different geometry, we know that there is anti-isotropism. From the intensity of Raman spectra we can see that there exists nonlinearity in this crystal, and its nonlinearity is mainly caused by BO3 triangles rather than the distortion of oxygen octahedra.

关 键 词：硼酸钙氧钆单晶 振动光谱 GDCOB晶体 稀土元素 拉曼光谱 提拉法 

分 类 号：O782.5[理学—晶体学] O733.9