组分离子浓度对铁电铌酸钾锂晶体Raman光谱的影响  

EFFECTS OF COMPOSITION IONIC CONCENTRATION ON THE RAMAN SPECTRA OF FERROELECTRIC POTASSIUM LITHIUM NIOBATE CRYSTALS

作　　者：万尤宝[1] 杨培志[2] 吴宇容[3] 袁国祥[3] 李新曦[4] Rong-Min Kang 

机构地区：[1]School of Material Sciences and Engineering Seoul National University [2]云南昆明物理研究所,云南昆明650223 [3]浙江省嘉兴学院,浙江嘉兴314000 [4]中国科学院上海技术物理研究所,上海200083

出　　处：《红外与毫米波学报》2005年第5期331-334,共4页Journal of Infrared and Millimeter Waves

基　　金：大韩材料基金资助项目(B20025671);大韩博士后基金资助项目(BK212002432);嘉兴市重点项目(SA0291);973重点项目(8921203)

摘　　要：测量了一批不同组分的铌酸钾锂晶体Raman光谱,发现晶体中位于C格位的Li离子浓度对晶体Raman光谱产生了强烈的影响:低Li含量晶体中[NbO6]7-八面体所对应的3个Raman特征光谱线没有发生峰分裂,在100～400cm-1范围出现的小峰与C格位Li离子浓度相关;当晶体中Li离子浓度增加时,与v5所对应的Raman峰在散射几何为X(ZY)Z对应的光谱中加宽,v2振动模式在两种散射几何中均出现分裂峰,并在100～400cm-1范围出现小峰数量增多;当Li离子浓度接近晶体化学组分时,微扰进一步加强,v5所对应峰分裂成3个峰,v1和v2振动模式发生部分分裂,在100～400cm-1范围小峰更为突出.Raman spectra of a batch of potassium lithium niobate（ KLN ） crystals with different compositions were investigated. The analysis results show the striking effects of Li content on these Raman peaks. For the KLN sample with small Li content, the three character peaks belong to [ NbO6 ]^7- Oh octahedron show simple peak, and the weak peaks in the wavelength range of 100 ～400 cm^-1 are regarded to relate to the Li ions in C lattice. With the raise of Li content in crystal, the peaks belong to v2 mode are partly split, and the peak belongs to v5 mode is broadened in the spectrum corresponding to scattering geometry X（ZY）Z. When the Li content approaches to chemical composition, the peaks belong to v5 mode are split, the peaks belong to v1 mode and v2 mode are partly split too.

关 键 词：铁电晶体 铌酸钾锂 振动模式 红外Raman振动光谱 

分 类 号：O4[理学—物理]