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采用提拉法生长了掺Ce的同成分LiNbO3(Ce:CLN)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-ray photoelectronspectroscopy,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Ce:CLN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。
Ce-doped LiNbO3 (Ce: CLN) crystals were grown by Czochralski method. X-ray powder diffraction shows that doping does not affect the crystal structure, and its space group is R3c. By X-ray fluorescence spectrometry, the effective segregation coefficient of cerium ion was 0.4. At room temperature, the transmittance of the crystal in the wavelength band of 700 ~ 3500nm reaches 75%. The effects of cerium ions on the electronic and phonon structures of lithium niobate were characterized by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. XPS results show that there is only pure +5 valences for niobium ions and no signal for cerium ions because of low concentration. The results of Raman spectroscopy showed that the modes of Al (TO4) and A1 (TO1) were almost the same as that of the pure LiNbO3 crystal except that the Ce (superscript 2 +) crystallizes mainly in the lattice Nb position.