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首页> 外文期刊>Journal of Crystal Growth >Flux growth and morphology study of stoichiometric lithium niobate crystals
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Flux growth and morphology study of stoichiometric lithium niobate crystals

机译：化学计量铌酸锂晶体的通量生长和形态研究

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The flux growth experiments of stoichiometric LiNbO_3 crystals were carried out at a low vertical temperature gradient from the fluxed melts with molar ratios of K_2O/LiNbO_3 = 0.16 and 0.19. The crystals were pulled along different directions perpendicular to X-cut, Y-cut, Z-cut and facet-cut planes. Crystal structure and inclusions-related defects were analyzed by X-ray diffraction (XRD) method. The stoichiometry of the as-grown crystal, which depended on its ultraviolet absorption edge, was studied by measuring its transmittance spectrum. The shape and facet morphology of crystal-melt interfaces for different growth directions were studied by X-ray orientation and projection analysis. It was found that the crystals grown under our thermal conditions exhibited a very strong tendency towards faceting. Highly convex and facet-bounded interfaces were observed for the growth directions perpendicular to the Z-cut, X-cut and Y-cut planes. The central part of the interface was always broken and contained a lot of inclusions due to the formation of many small pyramids consisting of (0 1 2), (112) and (102) facets. It was shown that the growth direction perpendicular to the facet was favorable for growing high quality stoichiometric LiNbO3 crystals at the low vertical temperature gradient.
机译：在低垂直温度梯度下，由助熔剂以摩尔比K_2O / LiNbO_3 = 0.16和0.19进行化学计量的LiNbO_3晶体的通量生长实验。沿垂直于X切割，Y切割，Z切割和小平面切割平面的不同方向拉动晶体。通过X射线衍射（XRD）方法分析晶体结构和与夹杂物有关的缺陷。通过测量其透射光谱，研究了所生长晶体的化学计量，该化学计量取决于其紫外吸收边缘。通过X射线取向和投影分析研究了不同生长方向的熔体界面的形状和小面形态。发现在我们的热条件下生长的晶体表现出非常强的刻面趋势。在垂直于Z形，X形和Y形平面的生长方向上观察到了高度凸面和小面边界的界面。由于形成了许多小金字塔，包括（0 1 2），（112）和（102）小面，所以界面的中心部分总是被打碎并包含很多夹杂物。结果表明，垂直于刻面的生长方向有利于在低垂直温度梯度下生长高质量的化学计量的LiNbO3晶体。

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