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组分离子浓度对铁电铌酸钾锂晶体Raman光谱的影响

Keywords: 铁电晶体铌酸钾锂振动模式红外Raman振动光谱

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Abstract:

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.

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