光折变材料Cu∶KNSBN的晶格振动和d－d电子跃迁  

Lattice Vibrations and d d Electron Transitions of Photorefractive Material Cu∶KNSBN

作　　者：夏海瑞[1,2] 于慧 胡连军[1,2] 王凯旋 赵壁英[1,2] 陈焕矗 杨兆荷[3] 

机构地区：[1]山东大学物理系 [2]北京大学物化所 [3]山东大学晶体所

出　　处：《光学学报》1996年第10期1510-1515,共6页Acta Optica Sinica

基　　金：国家自然科学基金;山东大学晶体所国家重点实验室资助

摘　　要：比较了铜掺杂钾钠铌酸锶钡（Ｃｕ∶ＫＮＳＢＮ）和钾钠铌酸锶钡（ＫＮＳＢＮ）两样品的晶格振动和ｄ－ｄ电子跃迁谱，对于拉曼（Ｒａｍａｎ）谱，Ａ１（ｚ）对称类的差别较小，Ｅ（ｘｙ）对称类的差别最大；对于红外反射谱，两对称类的均差别较大，认为Ｃｕ２＋部分填充了晶格Ａ位和Ｃ位，可见光范围内，ｄ－ｄ电子跃迁谱表明Ｃｕ２＋在晶体中形成两个深能级２．５０ｅＶ和２．６４ｅＶ。The lattice vibrational spectra and d d electron transition spectra of the Cu∶KNSBN are compared with that of the KNSBN. The differences in the Raman spectra are little for the symmetry species A 1(z) and are very great for the symmetry species E(xy); but in the infrared reflectivity spectra, the differences are great for both A 1(z) and E(xy). It is considered that the lattice sites A and C are partly occupied by the Cu 2+ doped. The d d electron transition spectra in the visible range show that the two deep energy levels of 2.50 eV and 2.64 eV are formed by the Cu 2+ .

关 键 词：钨青铜型 晶体 拉曼谱 红外反射谱 光折变特性 

分 类 号：O734.1[理学—晶体学]