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通过测量一批不同组成的铌酸钾锂晶体的Raman光谱,分析其晶体中组分离子浓度对晶体红外Raman光谱特征的影响,结果表明,晶体中位于C格位的Li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特征光谱线没有峰发生分裂,在100~400cm-1范围出现小峰与C格位Li存在相关;当晶体中Li浓度增加时,与v5所对应的Raman峰在散射几何为X(ZY)Z对应的光谱中有所加宽,v2振动模式在两种散射几何中均出现分裂峰,并在100~400cm-1范围内出现小峰数量增多;当Li浓度接近晶体化学组成时,微扰进一步加强,v5所对应的Raman峰分裂成3个峰,v1和v2振动模式发生部分分裂,在100~400cm-1范围内小峰更为突出。
The Raman spectra of a series of lithium potassium niobate crystals with different compositions were analyzed to analyze the influence of the component ion concentration on the infrared Raman spectra of the crystals. The results show that the Li concentration at the C-site in the crystal has a great influence on the Raman spectra Strongly influenced the three Raman characteristic lines corresponding to [NbO6] 7-octahedron in the low-Li crystal without splitting, and the small peak appeared in the range of 100-400 cm-1 correlated with the Li- When the Li concentration is increased, the Raman peak corresponding to v5 is broadened in the spectrum corresponding to the scattering geometry X (ZY) Z. The v2 vibration mode shows a splitting peak in both scattering geometries, and in the range of 100-400 cm -1. When the concentration of Li is close to the chemical composition of the crystal, the perturbation further strengthens. The Raman peak corresponding to v5 splits into three peaks, and the vibrational modes of v1 and v2 are partially split. At 100-400 cm -1 Small peak within the more prominent.