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测量了一批不同组分的铌酸钾锂晶体Ram an光谱,发现晶体中位于C格位的L i离子浓度对晶体Ram an光谱产生了强烈的影响:低L i含量晶体中[NbO6]7-八面体所对应的3个Ram an特征光谱线没有发生峰分裂,在100~400 cm-1范围出现的小峰与C格位L i离子浓度相关;当晶体中L i离子浓度增加时,与ν5所对应的Ram an峰在散射几何为X(ZY)Z对应的光谱中加宽,ν2振动模式在两种散射几何中均出现分裂峰,并在100~400 cm-1范围出现小峰数量增多;当L i离子浓度接近晶体化学组分时,微扰进一步加强,5ν所对应峰分裂成3个峰,ν1和ν2振动模式发生部分分裂,在100~400 cm-1范围小峰更为突出.
A series of Ram an spectra of potassium niobate crystals with different compositions were measured and it was found that the concentration of Li ion located at the C site in the crystal strongly influences the Raman spectra of the crystals: [NbO6] 7 - octahedron corresponding to the three Ram anantry spectral lines did not occur peak splitting in the range of 100 ~ 400 cm-1 small peak and C lattice L i ion concentration; when the crystal L i ion concentration increases, and ν5 corresponds to the Ram an peak broadened in the scattering geometry corresponding to X (ZY) Z spectrum, ν2 vibration mode appeared in both scattering geometry splitting peak, and in the range of 100 ~ 400 cm-1 small peak increased The perturbation intensified further when the concentration of Li ion was close to the crystal chemical composition. The peak corresponding to 5ν was split into three peaks, and the modes of ν1 and ν2 were partially split. The small peak in the range of 100-400 cm-1 was more prominent.