硅酸盐学报

掺铈铌酸锂晶体的生长和表征

作者：张娜娜王继扬颜涛韩淑娟郭永解

分类号：O782

出版年,卷(期):页码：2012,40(3):412-415

DOI：

摘要：

摘要：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 photoelectron spectroscopy，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。

Abstract: The Ce-doped congruent lithium niobabe (Ce:CLN) single crystal was grown by the Czochralski method. The result by X-ray diffraction shows that the as-grown crystal exhibits a single-phase (R3c) LN, and the doping of Ce ions into the CLN crystal lattice does not affect its basic crystal structure. The effective segregation coefficient of Ce ions determined by X-ray fluorescence analysis was 0.4. At room temperature, the transmittance of as-grown crystal was 75% in the range of 700–3500nm. The influence of Ce incorporation into CLN crystal lattice on the electronic and phonon structure was analyzed by X-ray photoelectron spectroscopy (XPS) and Raman scattering spectroscopy, respectively. The XPS results show that Nb ions only exhibit a pure +5 valence, and the signal of Ce ions is not recorded due to its low concentration. The Raman spectrum results show that the modes of as-grown Ce:CLN are similar to those of pure LiNbO₃ except for the little wave number shifting of A₁(TO₄) mode and shoulder linewidth of A₁(TO₁) mode, indicating that the Ce ions mainly occupy the Nb-sites in the as-grown crystal.

基金项目：

国家自然科学基金(50872066)；国家自然科学基金重点项目(51032004)和国家重点基础研究发展计划(2010CB833103)资助项目。

作者简介：

第一作者：张娜娜(1981—)，女，博士研究生。通信作者：王继扬(1946—)，男，教授。

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