Identification of LiNbO3, LiNb3O8 and Li3NbO4 phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy
Identification of LiNbO3, LiNb3O8 and Li3NbO4 phases in thin films synthesized with different deposition techniques by means of XRD and Raman spectroscopy
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DOI：
10.1088/0953-8984/25/20/205901
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发表时间：
2013-05-22
影响因子：
2.7
通讯作者：
Gleize, Jerome
中科院分区：
文献类型：
--
作者：
Bartasyte, Ausrine;Plausinaitiene, Valentina;Gleize, Jerome
采用常规x射线衍射技术研究了脉冲激光沉积、常压金属有机化学气相沉积和脉冲注入金属有机化学气相沉积三种方法在蓝宝石衬底上生长的外延/织晶LiNbO3薄膜的相组成。拉曼光谱对材料的对称性非常敏感，因此在成分分析中被用作复核。利用合成粉末的拉曼光谱，确定了LiNb3O8和Li3NbO4相的拉曼模式波数。研究了LiNbO3薄膜x射线衍射反射剖面的不对称性。这种不对称性可能有不同的来源，从而可能导致对织构LiNbO3薄膜相组成的错误结论。
Phase composition of epitaxial/textured LiNbO3 films on sapphire substrates, grown by pulsed laser deposition, atmospheric pressure metal organic chemical vapor deposition and pulsed injection metal organic chemical vapor deposition was studied by conventional x-ray diffraction techniques. Raman spectroscopy, being highly sensitive to the symmetry of materials, was used as a countercheck in the compositional analysis. The wavenumbers of Raman modes of LiNb3O8 and Li3NbO4 phases were identified from Raman spectra of synthesized powders. Asymmetry of profiles of x-ray diffraction reflections of LiNbO3 films was studied. This asymmetry may have different origins which consequently may result in misleading conclusions about phase composition of textured LiNbO3 films.