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Characterization of lithium niobate single crystal diffused with magnesium by DTA

机译：DTA表征镁扩散的铌酸锂单晶。

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摘要

Based on the report given by J. E. Mid winter that the refractive indices n_o and n_e of lithium niobate doped with magnesium (MgO:LiNbO_3) are lower than those of LiNbO_3, S. Sudo et al. achieved for the first time the core-cladding wave guide structure of LiNbO_3 single crystal fibers by using a Mg-ion indiffusion process in 1987. In this note, the Curie temperature of the Mg-diffused LiNbO_3 single crystal is investigated for the first time by means of differential thermal analysis (DTA) It is found that the Curie temperature of the Mg-diffused LiNbO_3 single crystal decreases with the increase of diffusion time at first, but beyond a limit, the Curie temperature starts to increase again and appears the second-phase transition point. It is well known that LiNbO_3 has only one Curie temperature; therefore, the second-phase transition point is probably the phase transition point of a new compound in MgO-rich layer of the Mg-diffused surface layer. These conclusions are proved further by X-ray diffraction analysis (XRD).
机译：S. Sudo等人根据J. E. Mid Winter的报告，掺镁的铌酸锂（MgO：LiNbO_3）的折射率n_o和n_e低于LiNbO_3的折射率。 1987年，采用Mg离子扩散工艺首次实现了LiNbO_3单晶纤维的芯-包层波导结构。在此说明中，首次研究了Mg扩散的LiNbO_3单晶的居里温度。差热分析（​​DTA）方法发现，首先，Mg扩散的LiNbO_3晶体的居里温度随扩散时间的增加而降低，但超过极限后，居里温度又开始升高，第二次出现。相变点。众所周知，LiNbO_3的居里温度只有一个。因此，第二相变点可能是新化合物在扩散了Mg的表面层的富MgO层中的相变点。通过X射线衍射分析（XRD）进一步证明了这些结论。

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