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掺铈铌酸锂晶体的生长和表征

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Abstract:

采用提拉法生长了掺Ce的同成分LiNbO3(CeCLN)晶体。X射线粉末衍射表明,掺杂并不影响晶体结构,其空间群为R3c。采用X射线荧光光谱分析方法,计算得到铈离子的有效分凝系数为0.4。室温下,晶体在700~3500nm波段的透过率达75%。利用X射线光电子谱(X-rayphotoelectronspectroscopy,XPS)和Raman光谱分别表征了铈离子对铌酸锂的电子和声子结构的影响。XPS结果表明,铌离子仅存在纯的+5价,铈离子由于浓度较小,未检测到信号。Raman光谱结果显示,除CeCLN晶体的A1(TO4)模波数和A1(TO1)模半峰宽较纯的LiNbO3晶体发生明显变化外,其余模都与其基本一致,表明铈离子主要进入晶格的Nb位置。

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