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《Journal Infrared Millimeter and Waves》 2005-05
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EFFECTS OF COMPOSITION IONIC CONCENTRATION ON THE RAMAN SPECTRA OF FERROELECTRIC POTASSIUM LITHIUM NIOBATE CRYSTALS

WAN You-Bao~(1,2,4),YANG Pei-Zhi~4,WU Yu-Rong~2,YUAN Guo-Xiang~2,LI Xin-Xi~3,Rong-Min Kang~1(1.School of Material Science and Engineering,Seoul National University,Korea;2.Jia-Xin Institution of Zhe-Jiang Province,Jiaxin,314000,China;3.Shanghai Institute of Technical Physics,CAS,Shanghai 100083,China;4.Kung-Ming Institute of Physics,Kungming 650233,China)  
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 ~(7-) O_h 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 ν_2 mode are partly split, and the peak belongs to ν_5 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 ν_5 mode are split,the peaks belong to ν_1 mode and ν_2 mode are partly split too.
【Fund】: 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)
【CateGory Index】: O734;
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